Question

answer all three questions please! thank you

1. What happens during the latent period of a muscle contraction?

a)

nothing

b)	ATP molecules are attaching to myosin heads

c)	Ca2+ ions are being actively transported back into the sarcoplasmic reticulum

d)	new contractile proteins are being synthesized

e)	Ca2+ ions are beginning to enter the sarcoplasm from the sarcoplasmic reticulum

2. The myofibril with the largest diameter are the

a)	smooth muscle fibres

b)	fast oxidative skeletal muscle fibres

c)	slow oxidative skeletal muscle fibres

d)	fast glycolytic skeletal muscle fibres

e)	cardiac muscle fibres

3. The thumb receives its major blood supply from the

a)	deep palmar arch

b)	cystic artery

c)	radial artery

d)	superficial palmar arch

e)	ulnar artery

Answer 1

1. Option e is the correct answer.

Latent period of muscle contraction indicates the duration between generation of action potential and contraction of muscles. During this period action potential travels and causes release of calcium ions from sarcoplasmic reticulum into the sarcoplasm which further interact with troponin-tropomysin complex for muscle contraction.

2. Option D is the correct answer.

Fast glycolytic skeletal muscle fiber have the largest diameter and posses large volume of glycogen to be used in glycolysis for ATP production.

3. Option C is the correct answer.

The princeps pollicis artery is the major artey that supplies the thumb. It arises from the radial artery and extended into the thumb.