Which of the following is made up of smooth muscle tissue?
Heart
Rectus abdominis
Esophagus
Pectoralis major
The Correct Answer is C
A. The heart is composed of cardiac muscle tissue, not smooth muscle. Cardiac muscle is specialized for rhythmic contractions to pump blood.
B. The rectus abdominis is composed of skeletal muscle tissue, which is voluntary and allows for movement of the trunk.
C. The esophagus contains smooth muscle tissue in its walls, which is responsible for the involuntary contractions (peristalsis) that move food from the mouth to the stomach.
D. The pectoralis major is composed of skeletal muscle tissue, which allows for voluntary control of arm movements.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Magnesium plays a role in many enzymatic reactions and muscle function, but it is not essential for thyroid hormone production.
B. Iodine is an essential element for normal thyroid function. The thyroid gland uses iodine to produce thyroid hormones (T3 and T4), which are critical for regulating metabolism. This is the correct element necessary for thyroid function.
C. Sodium is important for maintaining fluid balance and nerve function, but it is not directly involved in thyroid hormone production.
D. Calcium is important for bone health and cellular processes, but it does not directly influence thyroid hormone synthesis.
Correct Answer is D
Explanation
A. The superior and inferior vena cava carry deoxygenated blood from the body to the right atrium, not oxygenated blood to the left atrium.
B. The aorta carries oxygenated blood away from the left ventricle to the rest of the body but does not return it to the heart.
C. The pulmonary arteries transport deoxygenated blood from the right ventricle to the lungs for oxygenation, not the other way around.
D. The pulmonary veins are responsible for transporting oxygenated blood from the lungs to the left atrium, completing the pulmonary circulation.
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