MDS PREP
MCQ: Which of the following hormones stimulates the development of the corpus luteum and the secretion of progesterone?
1) Follicle-stimulating hormone (FSH)
2) Luteinizing hormone (LH)
3) Estrogen
4) Progesterone
Luteinizing hormone (LH) stimulates the development of the corpus luteum and the secretion of progesterone, which is crucial for maintaining the uterine lining.
What is the primary function of Secretin?
1) Stimulating the release of insulin
2) Increasing bicarbonate secretion in the pancreas
3) Promoting gastrin release
4) Activating the secretion of pepsinogen in the stomach
The primary function of Secretin is to increase bicarbonate secretion in the pancreas, helping to neutralize gastric acid in the duodenum.
What is the mechanism by which glucose is reabsorbed in the proximal tubules of the kidney?
1) Passive diffusion
2) Facilitated diffusion
3) Active transport
4) Osmosis
Physiology
Answer: 3
Glucose is reabsorbed via active transport mechanisms that involve sodium-glucose co-transporters (SGLTs) and glucose transporters (GLUTs).
The average time required for spermatogenesis in humans is:
1) 30 days
2) 42 days
3) 74 days
4) 120 days
Spermatogenesis, the process of producing mature sperm cells from spermatogonia, takes approximately 74 days in humans. This includes the development of spermatids and their subsequent transformation into spermatozoa.
What are the main characteristics of type I (slow twitch) muscle fibers?
1) High myoglobin content and oxidative metabolism
2) Low myoglobin content and oxidative metabolism
3) High actin and myosin content for rapid contraction
4) Large diameter and high glycolytic enzyme activity
Type I fibers are also called slow-twitch fibers due to their high myoglobin content, which supports aerobic metabolism and allows for sustained contractions over time.
An increase of the pressure within one of the carotid sinuses would result in an increase in
1) Mean arterial pressure
2) Cardiac output
3) The activity of the pressor center
4) The activity of cardiac vagal fibers
Physiology
Answer: 4
An increase of the pressure within one of the carotid sinuses would result in an increase in The activity of cardiac vagal fibers
What is the function of the middle piece in a sperm cell?
1) It produces the enzymes needed for sperm maturation
2) It contains the mitochondria for energy production
3) It is responsible for the sperm's ability to penetrate the egg
4) It is involved in the process of fertilization
Physiology
Answer: 2
The middle piece of the sperm cell is where the fibrous sheath is surrounded by spirally arranged mitochondria, which are the cell's powerhouses. They provide the energy required for the flagellum's movement during sperm motility.
In which brain regions are Broca's and Wernicke's areas located?
1) Inferior temporal gyrus and superior parietal gyrus
2) Inferior frontal gyrus and superior temporal gyrus
3) Superior frontal gyrus and middle temporal gyrus
4) Inferior parietal lobule and superior occipital gyrus
Answer: 2) Broca's area is located in the inferior frontal gyrus and is involved in motor speech, while Wernicke's area is located in the superior temporal gyrus and is associated with language comprehension.