Free Homeostasis MCQs with Answers
698 Homeostasis MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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Read the Homeostasis notesFree MDCAT chapter notes with key terms698 questions · page 34 of 35
- A. Sodium
- B. Calcium
- C. Potassium
- D. Bicarbonate Ions
Explanation: [A] Aldosterone is a steroid hormone secreted by adrenal glands and its main role is to regulate salt and water levels in blood.[B]…
Correct answer: Sodium- A. Distal Tubule
- B. Villi
- C. Cortical Tissue
- D. Proximal Tubule
Explanation: [A] Most of the reabsorption does not occur in DCT cells[B] Villi increases the surface area for absorption in Intestine not in nephron[C]…
Correct answer: Proximal Tubule- A. Peritubular capillaries
- B. Proximal convoluted tubules
- C. Efferent arterioles
- D. Afferent arterioles
Explanation: Bowman's capsule, a cup-like sac surrounding the glomerulus, is part of the nephron.
Correct answer: Proximal convoluted tubules- A. Glomerulus
- B. Proximal Tubule
- C. Ascending loop
- D. Descending loop
Explanation: The ascending loop is only permeable to salt ions such as Cl- and Na+. The descending loop, on the other hand, is permeable to water.
Correct answer: Ascending loop- A. Efferent arterioles
- B. Renal vein
- C. Vasa recta
- D. Afferent arterioles
Explanation: The renal artery divides to give afferent arterioles which further divide into the glomerulus network at the bowman's capsule, forming the…
Correct answer: Afferent arterioles- A. ADH release will be inhibited
- B. ADH will be released in large amount
- C. Aldosterone will be released
- D. Anterior pituitary will produce ADH
Explanation: The anterior pituitary gland would stop releasing ADH which would consequently make the collecting duct impermeable to water so that…
Correct answer: ADH release will be inhibited- A. Glomerulus.
- B. Influence of aldosterone.
- C. ADH influencing on collecting duct.
- D. Gradual increase in osmolarity from cortex to medullary portion.
Explanation: The major factor in producing hypertonic urine in mammals is gradually increasing osmotic concentration from the cortex to the medulla.
Correct answer: Gradual increase in osmolarity from cortex to medullary portion.- A. Reabsorption
- B. Pressure filtration
- C. Secretion
- D. Differential permeability
Explanation: Pressure filtration at the renal corpuscle is the least selective since all molecules with a molecular mass below 69000 pass through the…
Correct answer: Pressure filtration- A. Efferent arteriole
- B. Afferent arteriole
- C. Peritubular capillaries
- D. Collecting duct
Explanation: At the distal end of the glomerulus, the capillaries rejoin to form the afferent arteriole through which blood leaves the glomerulus.The…
Correct answer: Efferent arteriole- A. Heterotherms
- B. Endotherms
- C. Ectotherms
- D. None of these
Explanation: Heterotherms are those animals who are capable of varying degrees of endothermic heat production but generally do not regulate their body…
Correct answer: Heterotherms- A. Lateral ventricle
- B. Thalamus
- C. Spinal cord
- D. Hypothalamus
Explanation: The hypothalamus is a section of the brain that controls thermoregulation.
Correct answer: Hypothalamus- A. Urea
- B. Uric acid
- C. Creatinine
- D. Ammonia
Explanation: Urea is the major and immediate nitrogenous waste product of protein metabolism in humans and most mammals.
Correct answer: Ammonia- A. Kidney
- B. Liver
- C. Spleen
- D. Lungs
Explanation: b) Liver:This option states that urea formation occurs in the liver. This statement is correct.
Correct answer: Liver- A. urine
- B. ammonia
- C. uric acid
- D. urea
Explanation: Malphigian tubules are specialized excretory organs found in insects like cockroaches.
Correct answer: uric acid- A. Spleen
- B. Kidneys
- C. Liver
- D. Pancreas
Explanation: The liver is the primary organ where surplus amino acids are broken down.
Correct answer: Liver- A. Anaemia
- B. Diabetes
- C. Rickets
- D. Jaundice
Explanation: The correct answer is Jaundice. Jaundice is characterized by a yellowing of the skin, eyes, and mucous membranes due to elevated levels of…
Correct answer: Jaundice677. The birds excrete:
- A. Ammonia
- B. Urea
- C. Uric acid
- D. Acetic acid
Explanation: Birds excrete nitrogenous waste primarily in the form of uric acid. This adaptation is crucial for conserving water, as uric acid requires…
Correct answer: Uric acid- A. Coxal glands
- B. Flame cells
- C. Malpighian tubules
- D. Nephridia
Explanation: Crustaceans are members of the subphylum Crustacea (phylum Arthropoda), a group of invertebrate animals consisting of some 45,000 species…
Correct answer: Coxal glands- A. Thyroid gland
- B. Pituitary gland
- C. Adrenal gland
- D. Rectal gland
Explanation: The correct answer is the rectal gland, which is a specialized salt-secreting organ found in cartilaginous fishes like sharks.
Correct answer: Rectal gland- A. Onion
- B. Potatoes
- C. Guava
- D. Tomatoes
Explanation: Ovalates are abundantly present in tomatoes. They are a type of organic acid found in various fruits and vegetables, including tomatoes.
Correct answer: Tomatoes