Free Homeostasis MCQs with Answers

• A. Podocytes : create minute spaces (slit pores) for the filtration of blood into the Bowman's capsule
• B. Henle's loop : most reabsorption of the major substances from the glomerular filtrate
• C. Distal convoluted tubule : reabsorption of K + ions into the surrounding blood capillaries
• D. Afferent arteriole : carries the blood away from the glomerulus towards renal vein.

Explanation: The visceral layer of Bowman's capsule surrounds the glomerulus and is composed of special type of cells, the podocytes.

• A. When someone drinks lot of water, ADH release is suppressed.
• B. Exposure to cold temperature stimulates ADH release.
• C. An increase in glomerular blood flow stimulates formation of angiotensin II.
• D. During summer when the body loses a lot of water by evaporation the release of ADH is suppressed.

Explanation: Antidiuretic hormone (ADH) or vasopressin increases the reabsorption of water in the distal convoluted tubule, collecting tubules and…

• A. Reptiles and birds
• B. Birds and annelids
• C. Amphibians and reptiles
• D. Insects and amphibians

Explanation: Reptiles, birds, land snails and insects excrete nitrogenous wastes as uric acid in the form of pellet or paste with a minimum loss of…

• A. Descending limb of loop of Henle is impermeable to water
• B. Distal convoluted tubule is incapable of reabsorbing HCO3-
• C. Nearly 99% of the glomerular filtrate is reabsorbed by the renal tubules
• D. Ascending limb of loop of Henle is impermeable to electrolytes.

Explanation: Urine formation involves three main processes namely, glomerular filtration, reabsorption and secretion, that takes place in different…

• A. In kidneys but eliminated mostly through liver
• B. In kidneys as well as eliminated by kidneys
• C. In liver and also eliminated by the same through bile
• D. In the liver,but eliminated mostly through kidneys.

Explanation: The principle nitrogenous excretory compound in humans is urea.Urea is produced in a series of reactions (urea cycle) which take place in…

• A. Micturition will continue
• B. Urine will continue to collect normally in the bladder
• C. There will be no micturition
• D. Urine will not collect in the bladder

Explanation: Sensory stretch receptors are responsible for the stretch reflex. If these are removed then autonomic nervous system control will not be…

• A. Earthworm
• B. Cockroach
• C. Frog
• D. Man

Explanation: Cockroach shows uricotelism. Excretion of uric acid is known as uricotelism and the animals which excrete uric acid are called uricotelic.

• A. Less amino acids in his urine
• B. More glucose in his blood
• C. Less urea in his urine
• D. More sodium in his urine.

Explanation: During starvation, the body must rely on body proteins for the amino acids.

• A. 50 mm Hg
• B. 75 mm Hg
• C. 20 mm Hg
• D. 30 mm Hg

Explanation: Walls of glomerular capillaries and Bowman's capsule are very thin and are semipermeable due to the presence of pores in the former and…

• A. Fats
• B. Amino acids
• C. Glucose
• D. Ketones

Explanation: Under fasting conditions which are associated with high rate of fatty acid oxidation, the liver produces large amount of ketone bodies…

• A. There will be no urine formation.
• B. There will be hardly any change in the quality and quantity of urine formed
• C. The urine will be more concentrated
• D. The urine will be more dilute

Explanation: Reabsorption is a process by which useful constituents of glomerular filtrate are returned into the blood streams.

• A. Bowman's capsule
• B. Length of loop of Henle
• C. PCT
• D. Network of capillaries arising from glomerulus

Explanation: Concentration of urine depends upon the length of Henle's loop.Loop of Henle is the hairpin shaped section of a kidney tubule situated…

• A. Anuria
• B. Deamination
• C. Uremia
• D. None of these

Explanation: Anuria is the complete suppression of urine formation by the kidney. In this case most of the nephrons are destroyed.

• A. Nephridia
• B. Loop of Henle
• C. Nephron
• D. Pyramid

Explanation: A nephron is a unit of structure and function in a kidney. A kidney contains about a million nephrons, each approximately 3 cm long.

• A. Burst open and die
• B. Take water from the plasma
• C. Not be affected at all
• D. Shrivel and die

Explanation: As water potential in the body drops the water will move out of the cells by osmosis resulting in their death.

• A. Active transport
• B. Passive transport
• C. Osmosis
• D. Diffusion

Explanation: Glucose is taken back from the glomerular filtrate by the proximal convoluted tubule by active transport.

• A. Urea
• B. Uric acid
• C. Salts
• D. Glucose

Explanation: The cells lining the proximal convoluted tubule are well adapted for reabsorption of materials from the filtrate.

• A. Krebs' cycle
• B. EM pathway
• C. Ornithine cycle
• D. Cori cycle

Explanation: Urea is formed of two molecules of ammonia and one molecule of CO 2 . During catabolism, proteins break up into amino acids.

• A. Recognition of intrusion
• B. Effective and timely removal of intruders
• C. Mobilization of cells and cell products
• D. Blockage of entrance of intruders

Explanation: Blockage is not responsibility of immune system rather it is carried out by physical barriers.

• A. Infestation
• B. Disinfestation
• C. Immunity
• D. Antisepsis

Explanation: Infestation is a troublesome invasion of some parasite whereas disinfectation and antisepsis minimize the chances of infestation.However…