Free Homeostasis MCQs with Answers

• A. Failure of bone marrow is accompanied with renal failure.
• B. Destruction of RBC results from accumulated urea in the blood.
• C. Chronicity of the disease is respobsible for anemia
• D. Failure of proper RBC synthesis, due to lack of chemical stimulation.

Explanation: Damaged kidneys produce less erythropoietin, the hormone that stimulates bone marrow to form red blood cells, so renal failure can cause…

• A. Glucose
• B. Amino acids
• C. Nitrogenous waste
• D. All of these

Explanation: Glucose and amino acids are normally reabsorbed almost completely from the filtrate in the proximal convoluted tubule, whereas nitrogenous…

• A. Proximal convoluted tubule
• B. Descending limb of loop of Henle
• C. Ascending limb of loop of Henle
• D. Collecting tubules

Explanation: Antidiuretic hormone from the posterior pituitary acts mainly on collecting tubules, increasing their permeability to water and allowing…

• A. Protonephridium
• B. Metanephridium
• C. Malpighian tubules
• D. Nephrons

Explanation: Metanephridia are segmentally arranged excretory organs, with repeated units occurring in successive body segments of animals such as…

• A. Digestive tract
• B. Intestines
• C. Haemocoel
• D. Coelom

Explanation: Malpighian tubules are blind-ended tubes whose closed ends lie in the haemocoel, bathing in haemolymph and absorbing nitrogenous wastes…

• A. Calcium oxalate
• B. Calcium phosphate
• C. Uric acid
• D. All of these

Explanation: Calcium oxalate stones are the most common type of kidney stone and form when calcium combines with oxalate in concentrated urine.

• A. Crotical
• B. Medullary
• C. Juxtramedullary
• D. None of these

Explanation: Juxtamedullary nephrons have long loops of Henle extending deep into the medulla, along with vasa recta that support the countercurrent…

• A. Homeostasis
• B. Hemostasis
• C. Osmoregualtion
• D. Thermoregulation

Explanation: Osmoregulation is the control of water balance and the concentration of dissolved salts in an organism relative to its environment.

• A. Vasodilation
• B. Vasoconstriction
• C. Panting
• D. All of these

Explanation: Panting increases evaporation of water from the respiratory tract, and evaporation removes heat from a dog's body.

• A. 35 oC
• B. 36 oC
• C. 37 oC
• D. 38 oC

Explanation: The average internal temperature of a healthy human is approximately 37 °C, maintained by thermoregulatory mechanisms despite changes in…

• A. Walter Bradford Cannon
• B. Anselme Payen
• C. Jons jacob Berzeliis
• D. None of these

Explanation: Walter Bradford Cannon introduced the term homeostasis for the maintenance of a relatively stable internal environment.

• A. Thermal adaptation shown by animals
• B. wind adaptation shown by animals
• C. adaptation of animals to escape from predators
• D. none of the above

Explanation: Hibernation and aestivation are thermal adaptations in which animals reduce activity and metabolism during very cold or very hot…

• A. Endotherms
• B. Ectotherms
• C. Heterotherms
• D. Homeotherms

Explanation: Bats and hummingbirds are heterotherms because their body temperature and metabolic rate can vary, especially during torpor or periods of…

• A. 26 - 28°C
• B. 36 - 38°C
• C. 46 - 48°C
• D. 56 - 58°C

Explanation: Human enzymes and cells function best near 37°C, so normal mammalian body temperature is approximately 36 to 38°C.

• A. There is a definite control system that regulates the homeostatic activities
• B. Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment
• C. Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment
• D. All are correct

Explanation: Homeostasis does not keep the internal environment completely fixed; it maintains variables within a narrow range despite external…

• A. Change in membrane protein composition.
• B. Change in the solute composition of the cell membrane which prevents crystallization.
• C. Increase in proportion of unsaturated fatty acids.
• D. Development of heat shock proteins.

Explanation: Increasing unsaturated fatty acids keeps membrane lipids fluid at low temperatures because their bends prevent tight packing and crystal…

• A. Positive feed back
• B. Negative feed back
• C. Feed back
• D. Osmoregulation

Explanation: Negative feedback opposes a change: when body temperature rises, mechanisms such as sweating and vasodilation lower it toward the normal…

• A. Fore brain
• B. Hind Brain
• C. Thalamus
• D. Hypothalamus

Explanation: The hypothalamus contains the body's temperature-regulating centre and compares blood temperature with a set point to coordinate heat-loss…

• A. Protective
• B. Destructive
• C. Constructive
• D. Aggressive

Explanation: Pyrogens raise the hypothalamic temperature set point and trigger fever, which can hinder the growth or replication of some pathogens and…

• A. Fresh water mammals
• B. Terrestrial mammals
• C. Marine Mammals
• D. Flying mammals

Explanation: Marine mammals such as whales and seals possess blubber, a thick fat layer that reduces heat loss in cold water and also provides energy…