a person dies, and within hours, the skeletal muscles develop a locked contraction known as rigor mortis. calcium ions leak from the sarcoplasmic reticulum into cytoplasm. from your knowledge of cross bridge cycling, what best explains this rigor?

Answers

Answer 1

Rigor mortis is the stiffening of the body after death. After death, the body begins to get cold. From about two to six hours after death, the muscles start to stiffen, probably because the actin and myosin filaments of the muscle slide into each other. The rigor mortis starts at the eyelids, jaw and neck and then slowly spreads to all parts of the body within six hours.

Contrary to popular belief, rigor mortis will occur more quickly in high ambient temperatures than in cold conditions. This is because the underlying chemical reaction occurs faster at higher temperatures.  

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Related Questions

hello can anyone help me with this question thx

Answers

Answer:

A. W and X

Explanation:

Because W have just one valence electron, and X have 7, so it means that W will give its electron to X and that's the definition of an ionic bond

a student reacted 40 drops of an unknown amine with 20 drops of iodomethane in 2 ml of a suitable solvent mixture. after 15 minutes of reaction, a white precipitate formed. the precipitate was isolated and its melting point was recorded to be 178 °c. what could this precipitate be?

Answers

The compound formed is the quaternary ammonium salt N,N,N-trimethyl-1-phenylmethanaminium iodide.

Quaternary ammonium salts are formed when methyl iodide reacts with an amine. The quaternary ammonium salt is an ionic substance which often has a high melting point. Remember that the melting point of a substance can be used to identify the substance.

In this case, a student reacted 40 drops of an unknown amine with 20 drops of iodomethane in 2 ml of a suitable solvent mixture. after 15 minutes of reaction, a white precipitate formed. the precipitate was isolated and its melting point was recorded to be 178 °c. This precipitate must be N,N,N-trimethyl-1-phenylmethanaminium iodide (Benzyltrimethylammonium iodide) because it is a quaternary ammonium salt whose melting point is 178 °c.

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what physical properties could be used to separate iron filings from table salt

Answers

Answer:

Iron is magnetic and Salt is non magnetic

So Salt dissolves in water and Iron doesn't

Which grouping shows a decrease in Intermolecular
Forces of Attraction?
A) gas, liquid, solid B) liquid, solid, gas
C) solid, liquid, gas D) solid, gas, liquid

Answers

Answer:

C) solid, liquid, gas

Explanation:

Which grouping shows a decrease in Intermolecular

Forces of Attraction?

A) gas, liquid, solid B) liquid, solid, gas

C) solid, liquid, gas D) solid, gas, liquid

the further the particles are from each other, the less the intermolecular attraction  they are farthest in a gas, then a liquid, and closest in a solid

Which of these statements is not true?
A. Atoms of the same element can have different masses
B. The nucleus of an atom has a positive charge
C. Atoms of isotopes of an element have different numbers of protons
D. Atoms are mostly empty space
Option 5

Answers

Answer:

c.

Explanation:

They can have different neutron numbers, not proton numbers. If they were to have different proton numbers it would be classified as a different element.

which of the following is a physical property of the salt crystals shown here?
A.they are gas
B.they cannot burn
c.they are a liquid
D. they are clear white

Answers

yelyddlusheypupdldphdpdupdosigsogsg

Answer:

As the explanation i think the answer is D

Explanation:

Transparent and colourless in crystalline form – rather like ice. Crystallises in the isometric system, usually in the form of cubes. Soluble in water (35.6g/100g at 0°C and 39.2g/100g at 100°). Slightly soluble in alcohol, but insoluble in concentrated hydrochloric acid.Physical properties: Sodium chloride is a white crystalline solid with a density of 2.16 g/mL, and a melting point of 801 °C. It is also available as aqueous solutions of different concentrations, called saline solutions. Chemical properties: Sodium chloride is readily soluble in water and other polar solvents.

Which characteristic do valence electrons indicate about reactions between atoms?

A.bond type
B.electronegativity difference
C.bond number
D.absolute electronegativity

Answers

Answer:

the answer is Bond Number

Explanation:

b r u h  i just took the quiz and got the answer wrong lol

so turns out its BOND NUMBER

The whole Chemical Reaction Predictions Quick Check for Chemistry

1) chemical reaction

2) bond number

3) chemical bonds

4) C3H6O3

5) Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere

In a movable pulley system, where does the other effort come from? ​

Answers

Answer:

In a movable pulley system, where does the other effort come from? is carried by this end of the rope. This means that the structure (ceiling) does half the effort.

Explanation:

HELP PLEASE I HAVE A TEST TODAY AND I DON'T UNDERSTAND ANY OF THIS...
265 kilojoules of energy are added to 150g of ice at 0 degrees C how many grams of water would boil away

Answers

Answer:

About 67 grams or 67.39 grams

Explanation:

First you would have to remember a few things:

 enthalpy to melt ice is called enthalpy of fusion.  this value is 6.02kJ/mol

  of ice  

 it takes 4.18 joules to raise 1 gram of liquid water 1 degree C

 water boils at 100 degrees C and water melts above 0 degrees C

 1 kilojoules is 1000 joules

  water's enthalpy of vaporization (steam) is 40.68 kJ/mol

  a mole of water is 18.02 grams

  we also have to assume the ice is at 0 degrees C

Step 1

Now start with your ice.  The enthalpy of fusion for ice is calculated with this formula:

q = n x ΔH    q= energy, n = moles of water, ΔH=enthalpy of fusion

Calculate how many moles of ice you have:

150g x (1 mol / 18.02 g) = 8.32 moles

Put that into the equation:

q = 8.32 mol x 6.02 = 50.09 kJ of energy to melt 150g of ice

Step 2

To raise 1 gram of water to the boiling point, it would take 4.18 joules times 100 (degrees C)  or 418 joules.

So if it takes 418 joules for just 1 gram of water, it would take 150 times that amount to raise 150g to 100 degrees C.  418 x 150 = 62,700 joules or 62.7 kilojoules.

So far you have already used 50.09 kJ to melt the ice and another 62.7 kJ to bring the water to boiling.  That's a total of 112.79 kJ.

Step 3

The final step is to see how much energy is left to vaporize the water.

Subtract the energy you used so far from what you were told you have.

265 kJ - 112.79 kJ = 152.21 kJ

Again q = mol x ΔH (vaporization)

You know you only have 152.21 kJ left so find out how many moles that will vaporize.

152.21 kJ = mol x 40.68  or   mol = 152.21 / 40.68  = 3.74 moles

This tells you that you have vaporized 3.74 moles with the energy you have left.

Convert that back to grams.

3.74 mol   x  ( 18.02 g / 1 mol ) = 67.39 grams

19 What is the number of moles of nitrogen gas which react with 18 g of magnesium to form magnesium nitride compound ? [Mg = 24,N=14]
a) 0.25 mol 0 b) 0.5 mol C) 1 mol d) 2 mol​

Answers

Answer:

0.5 mol of nitrogen gas.

Explanation:

18g of Magnesium in mol is equal to 18g/24 gmol-1 = 0.75 mol and 7g of nitrogen in mol is equal to 7g/14 gmol-1 = 0.5 mol,

Thus, When 18g of magnesium reacts with 7g of nitrogen it implies 0.75 mol of magnesium which reacts with 0.5 mol of nitrogen. :)

The number of moles of nitrogen gas which react with 18 g of magnesium

to form magnesium nitride compound is 0.5mol.

We need to find the number of mole for magnesium and nitrogen.

Mole= mass/molar mass

Magnesium= 18g/24gmol⁻¹ = 0.75mol of Mg

Nitrogen= 7g/14gmol⁻¹ = 0.5mol of N

This implies that when 18g of magnesium reacts with 7g of nitrogen it

means 0.75 mol of magnesium which reacts with 0.5 mol of nitrogen.

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1. Select the animals which are vertibrates
A. Tigers
B. Lions
C. Butterfly
D. Frogs
E. Ants
F. Spiders
G. Dogs
H. Cats
I. Eagles
J. Snail

Answers

Answer:

A.Tigers

B.Lions

C.Frogs

G.Dogs

H.Cats

I.Eagles

What is the least apporaiate hypothesis for Eric to make?

Answers

Answer:

Where's the questions?

Which choice lists the different types of change in order of increasing energy
a) chemical, nuclear, physical
b) chemical, physical, nuclear
c) physical, chemical, nuclear
d) nuclear, chemical, physical

Answers

Answer:

Your answer is D.

Explanation:

Answer:

I would answer D

Explanation:

I might be wrong though

Which of the following sequences of elements would all have four valence electrons?

A.) B, Si, As, Te

B.) C, Si, Ge, Sn

C.) O, S, Se, Te

D.) Ga, Ge, As, Se

Answers

Answer:

Your answer should be B.) C, Si, Ge, Sn! I hope this helps you! :)

why is each individual produced by sexual reproduction unique?

Answers

Answer:

During sexual reproduction the genetic material of two individuals is combined to produce genetically diverse offspring that differ from their parents. The genetic diversity of sexually produced offspring is thought to give species a better chance of surviving in an unpredictable or changing environment.

An astronomer is describing an orbiting body she recently observed. Based on this description, determine which region of the solar system the body is most likely to reside in:

At its closest, the observed body was 2.4 AU from the Sun. At this point, we were able to determine that it was composed primarily of rock and metal, although we do not know exactly which metals it contains. Its orbit is not a perfect ellipse because it moves slightly every time Jupiter passes by.

asteroid belt
inner planets
outer planets
Kuiper Belt
Oort cloud

Answers

Answer:

Asteroid belt

Explanation:

Answer:

asteriod belt i think?

Explanation:

sorry if im wrong but Jupiter does pass pretty close to the asteroid belt

Brainliest?

If greenhouse gases in the atmosphere act like a blanket around the Earth, how is this "blanket” being changed by human activities?

It is getting thinner and keeping the Earth cooler.
It is getting thicker and keeping the Earth cooler.
It is getting thicker and keeping the Earth warmer.
It is getting thinner and keeping the Earth warmer.

Answers

Answer:

It is getting thicker and keeping the Earth warmer.

Answer:

it is getting thinner and keeping the earth warmer

when a carbohydrate is attached to a phospholipid what is the structure called

Answers

Answer:

Glycolipid

Explanation:

These are called glycolipids.

Glyco comes from the carbohydrate, and is a word relating to sugars, which are a type of carbohydrate

Lipid is a fat/oil, and as you could have guessed, comes from the phospholipid.

Hope I helped! :)

A carbohydrate attached to a phospholipid is called a glycolipid.

What is a glycolipid?

Glycolipids can be described as the complex type lipid containing carbohydrates, fatty acids, and glycerol groups.  The glycosidic term is used for any molecule containing one or more monosaccharides bound by glycosidic linkage.

Glycolipids can be also called structural lipids, which are generally found in the extracellular face of the cell membranes. Different types of glycolipid are Cerebroside and ganglioside.

Glycolipids provide energy to cells and help to determine the blood group. The blood group types determine from the oligosaccharides attached to a particular glycolipid on the surface of blood cells.

It assists the immune system of the body by destroying the pathogens in the human body.

A phospholipid is a lipid that is attached to the phosphate group. When the carbohydrate molecules attached to the lipid are known as glycolipid. Glycolipid plays an important role on the cell to cell interaction and cell differentiation.

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Name the compounds represented by the
following formulas.
a. Ca(NO2)2 c. (NH4)2Cr207
b. Fe(OH)3 d. CuCH3COO

Answers

Answer:

Canxi nito dioxit; Sắt oxit vàng; Amoni dicromat;đồng axitaxetic

Explanation:

What factors affect the strength of electric and magnetic forces?

Answers

Answer:

nature of the core material, strength of the current passing through the core

Explanation:

Have a great day

What is the molality of a solution containing 10.0 G of NA2 S04 and 1000.0 G of water

Answers

Explanation:

1 literThe total of water is equal to 1000.0 g of water

we need to find the molality of a solution containing 10.0 g of dissolved in  Na₂S0₄1000.0 g of water

1. For that find the molar mass

Na:  2 x 22.99= 45.98

S:  32.07

O:  4 x 16= 64

The total molar mass is 142.05

We have to find the number of moles, y

To find the number of moles divide 10.0g by 142.05 g/mol.

So the number of moles is 0.0704 moles.

For the molarity, you need the number of moles divided by the volume. So, 0.0704 mol/1 L.

The molarity would end up being 0.0704 M

The molality of a solution containing 10.0 g of Na2SO4 dissolved in 1000.0 g of water is  0.0704 Mliter

Bohr models do not correctly show the location of electrons in an atom explain why they are still useful to predict bonding of atoms

Answers

Answer:

looo

rdyxvxkxkvxkgxkgdkvx

Explanation:

lolollkvvbffffkhdhlxkgzfjzufsfjsdhayzyrzruzruzufzktzkgdjfdufskdgjgzjfgkzjgskf

Which of the following has the most thermal energy?

A full-size candy bar that is melting

A swimming pool on a sunny day

The entire atmosphere of the earth

1 gallon of boiling water

Answers

The one that has the most thermal energy out of the following is 1 gallon of boiling water.

Thermal energy is the energy generated by a material as a result of particle movement inside the material. Thermal energy causes things to have an internal temperature, which may be measured. The greater the temperature measured, the quicker the particles travel within the system.

The full-size candy bar that is melting melts at a slower particle rate compared to the 1 gallon of boiling water whose particles travel faster.

A swimming pool on a sunny day has average thermal energy. Also, the entire atmosphere of the earth may not experience the same amount of thermal energy from the sunlight.

Therefore, we can conclude that the most thermal energy out of the following is 1 gallon of boiling water.

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what the differenve between ionisation and dissociation

Answers

The key difference between ionization and dissociation is that dissociation is the process of separation of charged particles which already existed in the compound whereas ionization is the formation of new charged particles which were absent in the previous compound

Joshua loads a water balloon into a giant sling shot, pulls it back, and launches the balloon toward a target. The balloon misses the target by 3 feet, so he decides to try again. Which part of the process demonstrates an application of force?

Answers

When he pulls it back it applies force

Someone pls help me I will make you brain

Answers

The answer is C highest layer

What volume (in L) of 1.10 M FeCl₃ would be required to obtain 0.700 moles of Cl⁻ ions?

Answers

0.636 liters of the 1.10 M FeCl₃ solution to obtain 0.700 moles of Cl⁻ ions.

Thus, Volume (L)=  moles/ concentration.  0.700 moles of Cl⁻ ions and the concentration of the FeCl₃ solution is 1.10 M, you can plug in these values to calculate the volume.

Volume (L) = 0.700/ 1.10 M,

Volume (L)=  1.10M/ 0.700moles

Volume (L) = 0.700/ 1.10 ≈ 0.636 L

Therefore, approximately 0.636 liters of the 1.10 M FeCl₃ solution to obtain 0.700 moles of Cl⁻ ions.

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which type is every one in this picture: pure substance or mixture?​

Answers

Answer:

1,2,3,4,8,9,10,12,14,15 and 16

Explanation:

Coz they have different kinds (colours) of atoms

The rest are pure substances,

I'm not so sure though, double check after this

I need help with this question can someone help me with it

Answers

Answer:

sorry but can't understand your question properly

There is the answer

Can you convert this balanced equation into a nominative equation?

Answers

Answer:

yes you can

Explanation:

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