Which part of the urinary system has detrusor muscle in it?
Urinary Bladder
Ureter
Renal Artery
Kidney
The Correct Answer is A
A. Urinary Bladder: The urinary bladder is composed of smooth muscle, including the detrusor muscle, which contracts to expel urine during urination. The detrusor muscle allows the bladder to stretch as it fills with urine and contract when it's time to empty.
B. Ureter: The ureters are muscular tubes that transport urine from the kidneys to the bladder but do not contain detrusor muscle. They have a different type of smooth muscle that aids in peristalsis.
C. Renal Artery: The renal artery is a blood vessel that supplies blood to the kidneys and does not contain muscle tissue like the detrusor muscle.
D. Kidney: The kidneys are organs that filter blood to produce urine but do not contain detrusor muscle. They consist mainly of nephron structures for filtration and reabsorption.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Parasympathetic stimulation causes urine to be expelled from the bladder: The micturition reflex involves parasympathetic stimulation that causes the detrusor muscle of the bladder to contract, leading to urine expulsion.
B. The micturition process begins as the kidneys fill with urine and activate stretch receptors: Stretch receptors are located in the bladder, not the kidneys.
C. Distension of the bladder inhibits urine release: Distension activates stretch receptors, initiating the micturition reflex, not inhibiting it.
D. The micturition reflex is under conscious control only: While the brain can exert voluntary control over urination, the reflex itself is involuntary and controlled by the autonomic nervous system.
Correct Answer is A
Explanation
A. Rugae: The rugae are folds in the stomach lining that expand when the stomach fills with food, increasing surface area for digestion.
B. Microvilli: Microvilli increase surface area in the small intestine, not the stomach.
C. Peritoneum: The peritoneum is a membrane surrounding the abdominal cavity, not involved in surface area expansion of the stomach.
D. Muscularis: The muscularis is the muscle layer responsible for stomach contractions but does not increase surface area.
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