The principal nitrogenous exceretory compound in humans is synthesised

  • in kidneys but eliminated mostly through the liver

  • in kidneys as well as eliminated by kidneys

  • In liver and also eliminated by the same through bile

  • in the liver, but eliminated mostly through the ¬†kidneys

The figure shows a human urinary system with structure labelled A to D. Select option, which correctly identifies them and gives their characteristics and of function.

  • A - adrenal gland - located at the anterior part of kidney. Secrete catecholamines, which stimulate glycogen breakdown

  • B- pelvis -board funnel-shaped space inner to hilum, directly connected to loops of Henle

  • C - mediulla-inner zone of kidney and contains complete nephrons.

  • D - cortex -outer part of kidney and do not contain any part of nephrons

Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?

  • Neutrophils

  • Basophils

  • Eosinophils

  • Monocytes

Human urine is usually acidic because

  • The sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries.

  • Excreted plasma proteins are acidic

  • potassium and sodium exchange generates acidity

  • hydrogen ions are actively secreted into the filtrate

Sliding filament theory can be best explained as

  • When myofilaments slide pass each other actin filaments shorten while mysoin filament do not shorten

  • Actin and Myosin filaments shorten and slide pass each other

  • Actin and Myosin filaments do not shorten but rather slide pass each other

  • When myofilaments slide pass each other, Myosin filaments shorten while Actin filaments do not shorten

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