What is the name of the part of the distal convoluted tubule wall that is a part of the juxtaglomerular apparatus?
Vasa recta
Pedicel
Bowman's capsule
Macula densa
The Correct Answer is D
A. Vasa recta: This is a group of capillaries around the nephron loop (loop of Henle), not part of the distal convoluted tubule.
B. Pedicel: These are foot-like projections of podocytes in the glomerulus, not part of the distal convoluted tubule.
C. Bowman's capsule: This surrounds the glomerulus and is part of the filtration process, not the juxtaglomerular apparatus.
D. Macula densa: The macula densa is a group of cells located in the wall of the distal convoluted tubule that senses sodium concentration and regulates blood pressure and filtration rate.
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Related Questions
Correct Answer is B
Explanation
A. The testes would not maintain the proper temperature: Temperature regulation of the testes is controlled by the scrotum and muscles, not the prostate.
B. The flow of urine may be blocked or slowed: Benign prostatic hyperplasia (BPH), or an enlarged prostate, can compress the urethra, leading to difficulty urinating or weak urine flow.
C. Seminal fluid would not have the proper pH: The prostate contributes fluids to semen, but BPH typically affects urine flow more than seminal fluid pH.
D. Sperm would not be allowed to fully mature: Sperm maturation occurs in the epididymis, not in the prostate.
Correct Answer is B
Explanation
A. It protects the lungs from overinflating: While protective reflexes (like the Hering-Breuer reflex) exist to prevent overinflation, this is primarily a function of the lungs and the medulla, not directly the hypothalamus.
B. It modifies the medulla oblongata's functions: The hypothalamus influences the medulla oblongata, which controls the basic rhythm and rate of breathing, allowing the body to adjust ventilation in response to emotional states, temperature changes, and other stimuli.
C. It maintains the basic rhythm of breathing: The basic rhythm of breathing is primarily generated by the medulla oblongata and pons, while the hypothalamus modulates these functions rather than maintaining them directly.
D. It monitors the respiration rate in sleep and awake states: While the hypothalamus does play a role in the sleep-wake cycle, the actual monitoring of respiration rate is managed by the respiratory centers in the brainstem (medulla and pons).
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