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Muscle Contraction

Last updated 4 months ago

15 questions

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Question 7

7.

The green area here represents the

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Question 11

11.

The explanation of how thick and thin filaments slide relative to one another during striated muscle contraction to decrease sarcomere length is referred to as the (3 words)

Question 12

12.

Question 13

13.

Question 14

14.

Question 15

15.

If the starting length of a myofibril is 20mm in length, and after a solution of ATP and salt were applied, the final length of the myofibril is 11mm. What is the % contraction? (write the number only)

Question 1

1.

What is this structure?

Question 2

2.

What is this structure?

Question 3

3.

What is this structure?

Question 4

4.

This energy molecule is required for muscle contraction

Question 5

5.

What is this structure?

Question 6

6.

_______ diffusing in the cytoplasm between myosin and actin filaments of the muscle fibrils causes the filaments to slide into each other, triggering the contraction of the entire muscle fiber

Question 8

8.

This structure is called

Question 9

9.

This structure is called

Question 10

10.

These molecules that assist with sarcomere contraction are

Order the steps below in the correct sequence of muscle contraction.

As a nerve impulse reaches the ends of an axon terminal, it stimulates the release of acetylcholine from synaptic vesicles.

Energized myosin heads, with an attached ADP molecule and phosphate group, bind to the open myosin binding sites on actin. This forms the actin-myosin cross-bridge.

Acetylcholine then diffuses across the synaptic cleft and attaches to acetylcholine receptors on the sarcolemma at the neuromuscular junction.

Calcium binds to troponin on the actin filaments of muscle fibers. This signals tropomyosin to move out of the myosin binding sites on actin.

This action slides the thin actin past the thick filament, creating the power stroke.

An action potential is generated and travels along the sarcolemma

After the power stroke, the actin-myosin cross-bridge remains intact until an ATP molecule binds to the myosin head. After ATP attaches to myosin, the myosin detaches from actin.

After the cross-bridge forms, the myosin head rotates towards the center of the sarcomere. As it rotates, the myosin releases its ADP and phosphate.

Calcium is released from the sarcoplasmic reticulum.

Muscle cramps can be due to low levels of _____ . If these are deficient, the muscle cannot relax. 

ATP

Ca2+ ions

actin

myosin

ATP is required for muscle contractions to relax.

True

False