Which of the following scenarios would decrease the force of muscle contraction?

Question

Which of the following scenarios would decrease the force of muscle contraction?

SELECT ANY ACCURATE STATEMENTS

Question 1 options:

stimulation of a muscle that causes flexion along with its antagonistic muscle, the 'extension muscle.'

stretching muscles (slightly) above resting length

increasing (frequency of) nervous system stimulation of a muscle

decomposition of acetylcholine by acetylcholinesterase in the neuromuscular junction following an inital contraction

activating many motor units simultaneously

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Question 2 (1 point)

Under certain circumstances rigor mortis can be used to determine time of death. Why does rigor mortis occur?

SELECT ANY ACCURATE STATEMENTS.

Question 2 options:

Because no ATP is available to release attached actin and myosin molecules

Because sodium leaks out of a muscle cell

Because all muscle cells are dead and/or decomposed

Because proteins (actin and myosin) are being broken down in muscle cells

Because nervous tissue has started to decompose and can not silence muscle contractions

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Question 3 (1 point)

Cardiac Muscles are characterized by:

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Question 3 options:

being involuntary muscles

being highly vascularized

being an excitable tissue

being voluntary muscles

being regulated, in part, by calcium

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Question 4 (1 point)

Skeletal Muscles are characterized by:

SELECT ANY ACCURATE STATEMENTS

Question 4 options:

being regulated, in part, by calcium

being involuntary

being innervated

being highly vascularized

being an excitable tissue

stimulation of a muscle that causes flexion along with its antagonistic muscle, the 'extension muscle.'

stretching muscles (slightly) above resting length

increasing (frequency of) nervous system stimulation of a muscle

decomposition of acetylcholine by acetylcholinesterase in the neuromuscular junction following an inital contraction

activating many motor units simultaneously

Explanation / Answer

1. The force of a muscle contraction is controlled by the number of activated motor units.

2 : Rigor mortis is occures beacuse no ATP is available to release attached actin and myosin molecules.

With no continues distribution of ATP to the pumps, calcium starts to scatter from the extracellular matrix (and other intracellular compartments with high concerntations of calcium) into the sarcomere where it binds to troponin, a regulatory protein in skeletal muscles.

3. Cardiac muscles is characterised by being involuntary muscle .Heart muscles cannot be controlled voluntarily.

4.Skeletale muscles is characterised by being regulated, in part, by calcium

There is a protein named Troponin that helps to keep tropomyosin in place on the actin filament. For a muscle contraction to take place troponin and tropomyosin should move to reveal the myosin-binding sites. Calcium triggers movement of these proteins.

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