Next Structure and Components 2

Question 1

Which bone serves as the primary weight-bearing structure of the lower leg?

Accepted Answer

Tibia

Answer

The tibia is the larger, medial bone of the lower leg and bears the majority of body weight.

Question 2

The myelin sheath surrounding nerve fibers is produced in the peripheral nervous system by which cells?

Accepted Answer

Schwann cells

Answer

Schwann cells wrap around peripheral nerve axons to form the myelin sheath, which speeds signal conduction.

Question 3

The sinoatrial (SA) node is located in which chamber of the heart?

Accepted Answer

Right atrium

Answer

The SA node is embedded in the wall of the right atrium near the opening of the superior vena cava.

Question 4

Which component of a synovial joint produces synovial fluid?

Accepted Answer

Synovial membrane

Answer

The synovial membrane (synovium) lines the joint capsule and secretes synovial fluid for lubrication and nutrition.

Question 5

Which layer of the skin contains melanocytes responsible for skin pigmentation?

Accepted Answer

Stratum basale

Answer

Melanocytes are found in the stratum basale (deepest epidermal layer) where they produce melanin.

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