Excretion In Humans

Question 1

Homeostasis

Answer 1

Maintenance of a constant internal enviroment

Question 2

Hilus

Answer 2

Concave indentation of kidney where blood vessels and ureter connect

Question 3

Functions of kidney

Answer 3

1) Controls water ahd salt concentration in body

2) Removes nitrogenous waste

3) Regulates pH of blood plasma by controlling the acid base equilibrium of blood

4) NB
Maintain homeostasis by controlling composition and volume of body fluids

Question 4

Buffer

Answer 4

A chemical substance that prevents too great if a change in pH by binding with H+ ions if pH is too low or releasing H+ if pH is too high

Question 5

Micturition

Answer 5

Urination or expulsion of urine from bladder

Question 6

Osmoregulation

Answer 6

Maintaining the correct balance between water and solute contents if body fluids

Question 7

Osmolarity

Answer 7

The number of solute particles dissolved in one litre of water

Question 8

Diuretic

Answer 8

Causing increased output of urination

Question 9

Function of aldosterone

Answer 9

Controls concentration of sodium ions in the body

Question 10

Dialysis

Answer 10

The movement of molecules between two solutions of different compositions down their concentration gradient