Which hormone induces the growth of pubic and axillary hair at puberty?
Oxytocin
Progesterone
Prolactin
Testosterone
Correct Answer : D
Testosterone is an androgen, a type of sex hormone responsible for developing male characteristics, such as pubic and axillary hair, deepening of the voice, growth of the penis, and sperm production. Testosterone is produced by the testes in males and the ovaries and adrenal glands in females.
Choice A is wrong because oxytocin is a hormone that stimulates uterine contractions during labor and milk ejection during breastfeeding.
It does not affect hair growth at puberty.
Choice B is wrong because progesterone is a hormone that prepares the endometrium for implantation and maintains pregnancy.
It does not affect hair growth at puberty.
Choice C is wrong because prolactin is a hormone that stimulates milk production in the mammary glands.
It does not affect hair growth at puberty.
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Correct Answer is B
Explanation
Correct Answer is C
Explanation
Absorption of calcium from the digestive tract. This is because vitamin D is essential for maintaining bone density and healthy bone growth, and it stimulates calcium and phosphate uptake from the food we eat. Vitamin D is produced when the skin is exposed to ultraviolet rays from the sun, which convert a precursor molecule in the skin to an active form that travels to the liver and kidneys.
Choice A is wrong because elimination of toxins from the blood is not related to vitamin D, but to the kidneys and liver functions.
Choice B is wrong because increase in red blood cell production is not related to vitamin D, but to erythropoietin, a hormone produced by the kidneys.
Choice D is wrong because conservation of water in the plasma is not related to vitamin D, but to antidiuretic hormone, a hormone produced by the pituitary gland.
Correct Answer is B
Explanation
Carotid artery.
The carotid artery is a major blood vessel that supplies blood to the head and neck. It can be felt as a pulse on either side of the neck, just below the jawline.
Choice A is wrong because the subclavian artery is located below the clavicle (collarbone) and cannot be felt as a pulse on the neck.
Choice C is wrong because the brachiocephalic artery is a large vessel that branches into the right subclavian and right carotid arteries. It is located deep in the chest and cannot be felt as a pulse on the neck.
Choice D is wrong because the basilar artery is a vessel that forms at the base of the brain from the union of the two vertebral arteries. It cannot be felt as a pulse on the neck.
The normal range for pulse rate in adults is 60 to 100 beats per minute.
Correct Answer is B
Explanation
Vena cava. The vena cava is a large vein that carries blood from the body to the heart. It has two branches: the superior vena cava and the inferior vena cava, which drain blood from the upper and lower half of the body respectively.
Choice A is wrong because the jugular vein is a vein that drains blood from the head and neck.
It is not the vessel that carries blood from the whole body to the heart.
Choice C is wrong because the hepatic vein is a vein that drains blood from the liver.
It is not the vessel that carries blood from the whole body to the heart.
Choice D is wrong because the femoral vein is a vein that runs along the thigh and drains blood from the lower limb.
It is not the vessel that carries blood from the whole body to the heart.
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