How does the autonomic nervous system (ANS) contribute to homeostasis?
By controlling skeletal muscle contraction
By controlling voluntary muscle movements
By regulating involuntary body functions
By producing hormones
The Correct Answer is C
A. By controlling skeletal muscle contraction: Skeletal muscles are controlled by the somatic nervous system, not the autonomic nervous system, and are responsible for voluntary movements.
B. By controlling voluntary muscle movements: Voluntary muscle control is managed by the somatic nervous system, while the ANS operates involuntarily to maintain internal balance.
C. By regulating involuntary body functions: The ANS regulates involuntary activities such as heart rate, digestion, respiratory rate, and blood pressure, maintaining homeostasis without conscious effort.
D. By producing hormones: Hormone production is primarily the function of endocrine glands; the ANS influences some glands indirectly but does not produce hormones itself.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The Skull: The skull, or cranium, encases and protects the brain from mechanical injury. It consists of several bones fused together to form a rigid protective structure.
B. The Pelvic Girdle: The pelvic girdle supports the lower limbs and protects some pelvic organs but does not protect the brain.
C. The Vertebral Column: The vertebral column protects the spinal cord and supports the trunk but does not enclose the brain.
D. The Thoracic Cage: The thoracic cage shields the heart and lungs, providing support for respiration, but it does not protect the brain.
Correct Answer is A
Explanation
A. Left atrium: The left atrium receives oxygenated blood from the pulmonary veins after it returns from the lungs. It then contracts to pass this blood into the left ventricle for systemic circulation.
B. Right atrium: The right atrium receives deoxygenated blood from the superior and inferior vena cava. It sends this blood to the right ventricle, which then pumps it to the lungs for oxygenation.
C. Left ventricle: The left ventricle receives oxygenated blood from the left atrium and pumps it through the aorta to the body. It does not directly receive blood from the lungs.
D. Right ventricle: The right ventricle receives deoxygenated blood from the right atrium and pumps it into the pulmonary artery to the lungs. It does not handle oxygenated blood from the lungs.
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