Module 5- Muscle Physiology

A stiff muscle indicates there is not enough _____________ in the muscle cell.

• calcium

• neurotransmitter

• oxygen

• ATP

The role of acetylcholinesterase is to

• create more ATP when muscles tire

• destroy the ACh so a muscle will not stay contracted

• increase the amount of calcium ions at the synaptic cleft

• decrease the amount of neurotransmitter coming from the presynaptic neuron

Creatine phosphate utilization to make ATP does not require

• water

• carbon dioxide

• oxygen

• ADP

One muscle cell is called a

• sarcomere

• muscle fiber

• myofibril

• z disc

Between the power stroke and the return stroke, what binds to the myosin heads, causing them to release the active sites?

• calcium ions

• tropomyosin

• ATP

• ACh

What is a byproduct of anaerobic respiration?

• ATP

• lactic acid buildup in muscles, causing muscle soreness

• ACh

• epinephrine

Tags

NGSS.HS-LS2-3

The muscle fibers and the nerves that innervate are called

• a sarcomere

• a neuromuscular junction

• a motor unit

• the H zone

I bands consist of

• myosin fibers

• actin fibers

• tropomyosin

• sarcomeres contracting

A bundle of muscle fibers surrounded by perimysium

• belly of muscle

• sarcomere

• fascicle

• epimysium

In order for the action potential to continue across the synaptic cleft and create a change in the muscle cell, what must happen?

• ACh must be destroyed by acetylcholinesterase

• ACh must be released by the presynaptic terminal

• calcium ions are reabsorbed

• ADP is created from ATP