Digestive System and Excretory System

Question 1

function of digestive system?

Answer 1

break down large insoluble molecules in food to soluble molecules
to absorb these

Question 2

structure of digestive system?

Answer 2

mouth
oesophagus
stomach
small intes.
large intes.

Question 3

process of peristalsis?

Answer 3

waves of muscle contraction that moves balls of food along

Question 4

types of digestion?

Answer 4

mechanical - teeth grinding and stomach churning
chemical - bile and enzymes

Question 5

what does the body use digested food for?

Answer 5

to make new molecules
in aerobic respiration
growth renewal and repair
and energy storage

Question 6

organs involved in the excretory system?

Answer 6

liver
lungs
skin
kidneys

Question 7

funciton of exretory system?

Answer 7

remove toxic material and substances in organisms

Question 8

process of egestion?

Answer 8

undigestible components like cellulose and fibre
can be found in the faeces and the brown colour is due to bile pigments
expelled through the anus

Question 9

role of kidneys?

Answer 9

removal of urea
and adjusts water and ion content

Question 10

how is blood filtered in kidneys?

Answer 10

blood from aorta enters each kidney via renal artery
blood filtered to remove excess urea,water and salts
filtered blood returns to vena cava via renal vein
mixture removed is urine

Question 11

what happens in the tubule of the nephron?

Answer 11

all the small things like water glucose amino acids and urea
are absorbed

Question 12

what is selective reabsorption?

Answer 12

when molecules are reabsorbed
like glucose

some of the water by osmosis

but no urea