PAM Anatomy & Physiology Fundamentals 2

Question 1

Which type of connective tissue has the poorest blood supply, making it the slowest to heal after injury?

Accepted Answer

Cartilage

Answer

Cartilage is avascular, relying on diffusion for nutrients, which significantly slows its healing process.

Question 2

The sarcomere is the functional unit of skeletal muscle. Which band SHORTENS during muscle contraction?

Accepted Answer

Both I band and H zone

Answer

During contraction, the I band and H zone shorten as actin filaments slide toward the center, while the A band length remains constant.

Question 3

Which of the following correctly describes the role of the periosteum in bone physiology?

Accepted Answer

It contains osteoprogenitor cells essential for bone repair

Answer

The periosteum is a fibrous membrane covering bone that contains osteoprogenitor cells critical for fracture repair and bone remodeling.

Question 4

During the action potential of a motor neuron, what occurs during the absolute refractory period?

Accepted Answer

The neuron cannot be stimulated regardless of stimulus intensity

Answer

During the absolute refractory period, sodium channels are inactivated and the neuron is completely incapable of generating another action potential.

Question 5

A patient has a lesion affecting the C5-C6 dermatomes. Which area of skin sensation would most likely be impaired?

Accepted Answer

Lateral shoulder and forearm

Answer

Dermatomes C5-C6 cover the lateral shoulder, lateral arm, and lateral forearm, including the thumb side of the hand.

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