The layer of the skin that contains blood vessels is the
dermis
subcutaneous layer
Epidermis
Hypodermis
The Correct Answer is A
Rationale:
A. The dermis lies beneath the epidermis and contains blood vessels, lymphatic vessels, nerves, sweat glands, sebaceous glands, and hair follicles. The blood vessels in the dermis play a key role in regulating body temperature and nourishing both the dermis itself and the avascular epidermis above it.
B. Also called the hypodermis, this layer lies below the dermis and is composed mainly of fat and connective tissue. While it provides insulation, cushioning, and energy storage, the question specifically asks for the skin layer containing blood vessels, which is the dermis.
C. The epidermis is the outermost skin layer. It is avascular, meaning it contains no blood vessels. It relies on diffusion from the dermis for nutrient and waste exchange.
D. Another name for the subcutaneous layer. Although it contains larger blood vessels that supply the dermis, it is technically not considered part of the skin itself.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Rationale:
A. Smooth muscle (found in organs and vessels) and cardiac muscle (in the heart) function involuntarily under the autonomic nervous system. Skeletal muscle, on the other hand, is under voluntary control through the somatic nervous system.
B. This would be incorrect because skeletal muscle is not involuntary, and smooth/cardiac muscles are not voluntary.
Correct Answer is D
Explanation
Rationale:
A. This is a sugar component of DNA, not an energy source for muscle contraction.
B. This is a neurotransmitter that stimulates muscle fibers at the neuromuscular junction, initiating contraction. However, it is a signaling molecule, not the direct energy source.
C. These (DNA and RNA) store and transmit genetic information but do not supply energy for muscle contraction.
D. ATP is the immediate and primary energy source for muscle contraction. It provides energy for the cross-bridge cycle between actin and myosin filaments, as well as for pumping calcium back into the sarcoplasmic reticulum during relaxation. Without ATP, muscle contraction and relaxation cannot occur (as seen in rigor mortis).
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