Question 1

Which structure stores and releases Ca$$^{2+}$$ ions during skeletal muscle contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 2

During the first 6 seconds of high-intensity exercise, which energy source is primarily used to regenerate ATP?

Accepted Answer

Direct phosphorylation by creatine phosphate

Question 3

What is the correct order of the connective tissue layers from outermost to innermost in a skeletal muscle?

Accepted Answer

Epimysium \u003e Perimysium \u003e Endomysium

Question 4

Which of the following best describes the sequence of events leading to skeletal muscle contraction?

Accepted Answer

Neuromuscular junction events \u003e Muscle fiber excitation \u003e Excitation-contraction coupling \u003e Cross bridge cycling

Question 5

Which lever system is most common in the human skeletal muscle system?

Accepted Answer

Third-class lever

Question 6

If the myelin sheath of a neuron is damaged, which symptom is most likely to occur?

Accepted Answer

Slower neural transmission

Question 7

Which cranial nerve innervates the muscles of facial expression?

Accepted Answer

Cranial nerve VII (Facial)

Question 8

Which muscle is primarily responsible for chewing and is innervated by cranial nerve V?

Accepted Answer

Masseter

Question 9

What would happen if the serratus anterior muscle was not functioning properly?

Accepted Answer

Scapular winging

Question 10

Which of the following is a real-life example of a second-class lever in the human body?

Accepted Answer

Standing on tiptoes using the calf muscle

Question 11

Which process is responsible for the rapid regeneration of ATP during the first few seconds of intense muscle activity?

Accepted Answer

Direct phosphorylation of ADP by creatine phosphate

Question 12

Which type of neuron is most abundant in the human body and is the major neuron type in the CNS?

Accepted Answer

Multipolar

Question 13

If a patient presents with localized muscle weakness but normal cognition, which nervous system is most likely affected?

Accepted Answer

Peripheral nervous system (PNS)

Question 14

Which muscle is the prime mover for breathing and is innervated by the phrenic nerve?

Accepted Answer

Diaphragm

Question 15

Which of the following best describes the function of astrocytes at the neuromuscular junction?

Accepted Answer

Capture and recycle excess acetylcholine (ACh)

Question 16

Which of the following is NOT a way that ATP is regenerated in skeletal muscle?

Accepted Answer

Photosynthesis

Question 17

If a person has difficulty abducting their arm, which muscle is most likely affected?

Accepted Answer

Deltoid

Question 18

Which of the following best describes the role of T tubules in skeletal muscle contraction?

Accepted Answer

Transmit action potentials deep into the muscle fiber

Question 19

Which muscle group stabilizes the body and supports the abdominal cavity?

Accepted Answer

Abdominal muscles

Question 20

Which of the following is a characteristic of somatic nervous system function?

Accepted Answer

Voluntary control of skeletal muscles

A&P Exam 3

Study Guide - Practice Questions