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Which layer of the skin contains blood vessels and nerve endings?

A.

Basement membrane

B.

Hypodermis

C.

Epidermis

D.

Dermis

Answer and Explanation

The Correct Answer is D

A. Basement membrane: This is a thin, non-cellular adhesive layer that anchors the epidermis to the dermis. It does not contain its own blood supply or complex nerve endings.

B. Hypodermis: While the hypodermis (subcutaneous tissue) does contain larger blood vessels and nerves, the question describes the characteristics of the "skin." The dermis is the classic answer for the vascularized and innervated layer of the skin itself, often contrasted with the avascular epidermis.

C. Epidermis: The epidermis is avascular (has no blood vessels) and receives its nutrients via diffusion from the dermis below. It has free nerve endings but lacks the rich vascular network found in the dermis.

D. Dermis: The dermis is highly vascular (rich in blood capillaries) to regulate temperature and provide nutrients. It is also packed with sensory receptors (nerve endings) for touch, pressure, heat, and pain.


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Related Questions

Correct Answer is C

Explanation

A. Carbohydrate metabolism:While the liver plays a massive role in carbohydrate metabolism (glycogenesis/gluconeogenesis), these processes rely on enzymatic reactions. While enzymes are proteins, the most immediate and critical systemic sign of hepatic protein synthesis failure is usually related to circulating plasma proteins, not the liver's internal metabolic ability.

B. Immune defense:While the liver produces some complement proteins involved in immunity, the primary defense system relies on White Blood Cells (leukocytes) produced in the bone marrow and lymphoid tissue.

C. Blood clotting:The liver is responsible for synthesizing most of the essential coagulation factors (proteins) found in the blood, including fibrinogen and prothrombin. If the liver cannot produce these proteins, the coagulation cascade fails, leading to an increased risk of bleeding.

D. Fat digestion:Fat digestion relies on bile acids. While the liver synthesizes bile, bile acids are cholesterol derivatives, not proteins.

Correct Answer is B

Explanation

A. Distal:Distal means farther from the point of attachment or farther from the trunk/center of the body (used for limbs). It does not indicate “closer to the head.”

B. Superior: Superior (also called cranial) means toward the head or upper part of a structure - i.e., closer to the head.

C. Inferior:Inferior means below or toward the feet - farther from the head. It is the opposite of superior.

D. Proximal:Proximal means nearer to the point of attachment to the trunk or nearer to the origin of a structure (used for limbs). It does not mean closer to the head unless the trunk/attachment happens to be superior, so this term is not the correct general term for “closer to the head.”

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