Question

1. True -False. If a statement is True, place a T to the left of it. If a statement is False, place an F to the left of it.

Thin filaments in smooth muscles attach to Z discs.

The majority of ventricular filling occurs during the period of atrial contraction known as the period of rapid filling.

Closure of the atrioventricular valves occurs at the end of diastole/beginning of systole.

Tetanus in skeletal muscles is the result of increasing the strength of the stimulus while keeping the frequency of stimulation constant.

Endurance training increases the number of mitochondria in skeletal muscles

Sarcomeres contain elastic titin filaments which help the muscles return to their resting length during muscle relaxation

A greater pressure in the right ventricle than the aorta causes the aortic semilunar valve to open.

Cross-bridge formation occurs when myosin heads attach to actin molecules located in the thin filaments.

Ca2+ must bind to tropomyosin so that the myosin binding sites on actin will be accessible to the myosin.  

Transverse tubules contain voltage-gated calcium channels that respond to membrane depolarization and are directly coupled to the calcium release channels in the sarcoplasmic reticulum.   

Motor unit recruitment allows for decreased contraction strength

Myosin will not bind to actin unless ADP is bound to the myosin head.

In skeletal muscles, transverse tubules contain voltage-gated calcium channels that respond to membrane depolarization and are directly coupled to the calcium release channels in the sarcoplasmic reticulum

Summation occurs in muscle cells when stimulus frequency increases to produce a greater force contraction.

Slow twitch fibers have the greatest resistance to fatigue.

Answer 1

1. True.

2. True.

3.true

4.True.

5. False

6. True

7. True

8. True

9. True

10. True

11. False

12. True

13.True

14. True

15. True