What will happen if the stretch receptors of the urinary bladder wall are totally removed?

Solution

Micturition is same as urination. Urination or micturition is the act of passing urine which is a reflex phenomenon.As urine accumulates in bladder the stretch receptors are activated and pass the stimulus to the CNS. In the absence of stretch receptors the urine would get collected and probably overflow.

Uric acid is the chief nitrogenous component of the excretory products of

Solution

Uric acid is the chief nitrogenous component of the excretory product of cockroach. Animals which live in dry conditions have to conserve water in their bodies. Therefore, they synthesise crystals of uric acid from ammonia. Uric acid crystals are non-toxic and can be retained in the body for a considerable time. Uricotelic animals include most insects e.g. cockroach, reptiles and birds.

Which one of the following statements in regard to the excretion by the human kidneys is correct?

Descending limb of Loop of Henle is impermeable to water
Distal convoluted tubule is incapable of reabsorbing HCO₃
Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubules
Ascending limb of Loop of Henle is impermeable to electrolytes

Solution

Urine formation involves three main process called,glomerular filtration, reabsorption and secretion. A comparison of the volume of the filtrate formed per day(which is 180 litres per day) with that of urine released(about 1.5 litres) suggest that nearly 99 percent of the glomerular filtrate is reabsorbed by the renal tubules. The descending limb of loop of Henle is permeable to waterbut impermeable to electrolytes. The ascending limb is impermeable to water but allows transport of electrolytes.Reabsorption of sodium ions and water takes place indistal convoluted tubule.

The principal nitrogenous excretory compound in humans is synthesised

Solution

The principal nitrogenous excretory compound in humans is urea. It is synthesized in the mitochondrial matrix and cytosol of liver cells and eliminated through kidneys.

Which one of the following is not a part of a renal pelvis?

Solution

Renal pelvis is the innermost portion of kidney. So,collecting ducts are not a part of renal pelvis.

A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This O₂

Solution

A large portion of oxygen is left unused in the human blood even after its uptake by the body tissues. This O₂ acts as a reserve during muscular exercise.

Which one of the following correctly explains the function of a specific part of a human nephron ?

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

Solution

Podocytes are highly specialized cells with a complex cytoarchitecture plays a major role in establishing the selective permeability of glomerular filtration barrier.

Which one of the following statements is correct with respect to kidney functions?

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

Uricotelic mode of passing out nitrogenous wastes is found in

Solution

An uricotelic organism produces uric acid as a result of deamination. Examples of such organisms are birds and insects.

Ureters act as urogenital ducts in

Solution

In male frogs the sperms are carried through the ureters,hence in male, ureters are called urinogenital ducts.

UnAttempted

0

Attempted

Correct

Wrong