What is the response of cells in the collecting tubules in the nephrons when antidiuretic hormone (ADH) is secreted?
Large quantities of dilute urine are formed.
The tubules become impermeable to water.
Serum potassium retention increases.
Water is reabsorbed from the urinary filtrate.
Correct Answer : A
The correct answer is choice D. Water is reabsorbed from the urinary filtrate. This is because ADH (antidiuretic hormone) increases the permeability of the cells in the collecting tubules to water, allowing more water to be reabsorbed back into the bloodstream and reducing urine volume.
Choice A is wrong because large quantities of dilute urine are formed when ADH is low or absent, not when it is secreted.
Choice B is wrong because the tubules become more permeable to water, not imper
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Correct Answer is D
Explanation
Choice A is wrong because callus formation and callus ossification occur after hematoma formation, not before.
Choice B is wrong because bone remodeling is the last stage of bone repair, not the first.
Choice C is wrong because hematoma formation is the first stage of bone repair, not the third.
Hematoma formation is when blood clots form at the site of the fracture.
Callus formation is when a soft mass of tissue forms between the broken ends of the bone.
Callus ossification is when the callus is replaced by woven bone and cartilage.
Bone remodeling is when the excess bone tissue is removed and compact bone is formed
Correct Answer is B
Explanation
The correct answer is choice B. Left ventricle. The left ventricle has the thickest wall because it pumps blood to the whole body through the aorta, which requires a lot of pressure.
The other choices are wrong because:
Choice A. Left atrium. The left atrium receives blood from the lungs through the pulmonary veins, which does not require a lot of pressure. Choice C. Right atrium. The right atrium receives blood from the body through the superior and inferior vena cava, which does not require a lot of pressure. Choice D. Right ventricle. The right ventricle pumps blood to the lungs through the pulmonary artery, which requires less pressure than the left ventricle.The normal range of wall thickness for the left ventricle is 0.6 to 1.1 cm. The normal range of wall thickness for the right ventricle is 0.3 to 0.5 cm.
Correct Answer is B
Explanation
The correct answer is choice B. Endocrine glands secrete chemicals into the blood. This is because endocrine glands are ductless glands that release their products (hormones) directly into the bloodstream, where they can reach their target cells throughout the body.
Choice A is wrong because salivary glands are exocrine glands, not endocrine glands. Exocrine glands secrete their products into ducts that lead to an internal or external surface.
Choice C is wrong because it describes exocrine glands, not endocrine glands. Exocrine glands release their secretions on an internal or external surface via ducts.
Choice D is wrong because it also describes exocrine glands, not endocrine glands. Endocrine glands do not secrete their products into ducts, but directly into the blood.
Correct Answer is B
Explanation
The correct answer is choice B. Ear wax.
Ceruminous glands are specialized sweat glands that are located in the external auditory canal.
They secrete a waxy substance called cerumen or ear wax by mixing their secretion with sebum and dead epidermal cells. Cerumen helps to protect the ear from physical damage and infection.
Choice A is wrong because sebum is secreted by sebaceous glands, not ceruminous glands. Sebum is an oily substance that lubricates and protects the hair and skin.
Choice C is wrong because mucus is secreted by mucous glands, not ceruminous glands. Mucus is a slippery substance that moistens and protects the inner lining of various organs.
Choice D is wrong because keratin is not a secretion, but a protein that forms the structure of hair, nails and skin.
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