Question 1

Which of the following best describes the process of endochondral ossification?

Accepted Answer

Bone forms by replacing a hyaline cartilage model, beginning in the diaphysis and progressing toward the epiphyses.

Question 2

A patient presents with muscle spasms and tingling sensations. Blood tests reveal hypocalcemia. Which hormone is most likely to be secreted in response, and what is its primary effect on bone?

Accepted Answer

Parathyroid hormone (PTH); increases osteoclast activity to release calcium from bone.

Question 3

Which of the following best explains why compact bone is more suitable for weight-bearing than spongy bone?

Accepted Answer

Compact bone is organized into osteons with concentric lamellae, providing strength along the axis of the bone.

Question 4

During muscle contraction, which event directly triggers the exposure of active sites on actin filaments?

Accepted Answer

Release of calcium ions from the sarcoplasmic reticulum, binding to troponin.

Question 5

A muscle fiber is stimulated at a frequency that does not allow complete relaxation between stimuli, resulting in a sustained but wavering contraction. This phenomenon is known as:

Accepted Answer

Incomplete tetanus

Question 6

Which of the following best describes the role of creatine phosphate in muscle energetics during the first few seconds of intense exercise?

Accepted Answer

It directly donates a phosphate group to ADP to rapidly regenerate ATP.

Question 7

A patient suffers a greenstick fracture. Which statement best describes this type of fracture?

Accepted Answer

The bone is bent and partially broken, common in children.

Question 8

Which of the following is a property of Type I (slow-twitch) muscle fibers?

Accepted Answer

They have abundant myoglobin and mitochondria, making them resistant to fatigue.

Question 9

Which of the following best explains why myelinated axons conduct action potentials faster than unmyelinated axons?

Accepted Answer

Myelination allows action potentials to jump between nodes of Ranvier in a process called saltatory conduction.

Question 10

Which of the following best describes the function of osteoclasts in bone tissue?

Accepted Answer

They resorb bone matrix, releasing calcium and phosphate into the blood.

Question 11

A neuron receives simultaneous excitatory postsynaptic potentials (EPSPs) from multiple presynaptic neurons. This process is known as:

Accepted Answer

Spatial summation

Question 12

Which of the following best describes the role of acetylcholinesterase at the neuromuscular junction?

Accepted Answer

It breaks down acetylcholine in the synaptic cleft, terminating the signal.

Question 13

Which of the following best explains why a muscle can generate the greatest force at an optimal length, according to the length-tension relationship?

Accepted Answer

At optimal length, there is maximal overlap between thick and thin filaments, allowing the greatest number of cross-bridges to form.

Question 14

Which of the following is a function of astrocytes in the central nervous system?

Accepted Answer

They maintain the blood-brain barrier and regulate the extracellular environment.

Question 15

A muscle is contracting but does not change in length. Which type of contraction is occurring?

Accepted Answer

Isometric contraction

Question 16

Which of the following best describes the role of the epiphyseal plate in long bone growth?

Accepted Answer

It is a region of hyaline cartilage where interstitial growth lengthens the bone.

Question 17

Which of the following best explains why fast-twitch (Type II) muscle fibers fatigue more quickly than slow-twitch (Type I) fibers?

Accepted Answer

They have fewer mitochondria and rely more on anaerobic glycolysis for ATP production.

Question 18

Which of the following best describes the function of the blood-brain barrier?

Accepted Answer

It selectively restricts the passage of substances from the blood into the brain, protecting neural tissue.

Question 19

Which of the following best describes the mechanism by which an action potential is propagated along an unmyelinated axon?

Accepted Answer

The action potential is regenerated at every point along the axon in a process called continuous conduction.

Question 20

A patient is unable to relax their muscles after contraction, resulting in sustained muscle contraction. Which of the following is most likely deficient?

Accepted Answer

Acetylcholinesterase

Bone, Muscle, and Neural Histology & Physiology: ANP Study Guide

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