Test 3 (centered)

Question 1

A-Band

Answer 1

The section of the sarcomere that corresponds with the alignment of myosin and actin filaments.

Question 2

Acetylcholine

Answer 2

A neurotransmitter released when an action potential arrives at the nerve terminal. The Acetylcholine diffuses across the neuromuscular junction causing excitation of the sarcolemma.

Question 3

Actin

Answer 3

A protein that forms actin myofilaments. Actin filaments consist of two thin strands about 6nm in diameter arranged in a double helix.

Question 4

Action potential

Answer 4

An electrical impulse from a motor nerve that signals the release of calcium from the sarcoplasmic reticulum into the myofibril, causing tension development in the muscle.