Anatomy exam questions

what are the contractile proteins within Skeletal muscle?

actin and myosin

What are the regulatory proteins in skeletal muscle?

Troponin and tropomyosin

Describe what changes occur in the sarcomere when a muscle contracts, including Z disc, I band, and A band

The I band shortens, Z disc move closer together, and the A band stays the same length but has increased overlap of actin and myosin

What is found at the neuromuscular junction?

Motor neuron axon terminal, synaptic cleft, and motor endplate on the muscle fiber

What is the source, role, and fate of acetylcholine (ACh) in the neuromuscular junction?

Motor neurons; role: initiates muscle contraction; fate: broken down by acetylcholinesterase

What allows calcium to be released from the sarcoplasmic reticulum (SR)?

The action potential that has traveled down the sarcolemma and into the T-tubules

What is anaerobic ATP production?

ATP production in the absence of oxygen; it produces small amounts of ATP quickly

What is aerobic ATP production?

ATP production in the mitochondria with the utilization of oxygen; it is the primary source of ATP during endurance exercise

What is eccentric versus concentric contraction?

Eccentric contraction is when a muscle generates tension while lengthening