excertion

Question 1

what means excertion

Answer 1

is the removal of metobalic wastes,toxins,and excess substance from the body

Question 2

what are the excerotry organs and what they excerete

Answer 2

kidney:urea,water,mineral ions and salts
lungs:carbon dioxide
skin:water and excess mineral ions

Question 3

how is urea formed

Answer 3

urea is formed in the liver as a waste product of deamination[break down of excess amino acid]

Question 4

renal artery

Answer 4

branches off from the aorta and brings oxygenated blood to the kidneys

Question 5

renal vein

Answer 5

takes deoxyganted blood away from the kidneys to the vena cava

Question 6

ureter

Answer 6

is a tube that carries urine from each kidney to the bladde

Question 7

bladder

Answer 7

is a muscular sac that stores urine before it is excereted out of the body through the urethra

Question 8

urethra

Answer 8

a tube that carries urine out of the body

Question 9

ultra filtration

Answer 9

a passive process by which components of the plasma[water,salts,urea,glucose and ammino acids] are filtered out of the glomerulus under high pressure to form glomerular filterate in bowman’s capsule.,but protien and glucose dont leak out due to their large sized

Question 10

selective reabsorption

Answer 10

an active process where glucose and amino acids are reabsorbed in the proximal convoluted tubule by active transport which requires energy

Question 11

explain why there are no plasma protiens in the urine

Answer 11

plasma protien are large
does not pass through bowman’s capsule

Question 12

what happen if water decrease in blood

Answer 12

osmoreceptor in hypothalmus detect ddecrase in amount of water in blood
hypothulmus sends signals to pitutery gland
pitutery gland releases more adh in blood
concentration of adh to collecting duct
collecting duct become permeable to water
more water reabsorbed
less water in urine
this is controlled by negative feedback

Question 13

what happen if water increase in blood

Answer 13

osmoreceptor in hypothalmus detect increase in water in blood
no sitmulation puritary gland
so no release of adh
collecting duct will reabsorb less water
more water in urine lost
this is controlled by postive feedbackx

Question 14

if we find glucose in urine what disease

Answer 14

diabetes

Question 15

if we find blood cells/protien in urine what disease

Answer 15

kidney disease
hypertension

Question 16

explain why there is no glucose in the urine

Answer 16

as glucouse reabsorbed by proximal convoluted tubul
using active transport

Question 17

describe the structre of the kidney refer to the structure of the nephron in your answer

Answer 17

glomerulus
cortex
loop of henle
madulla
collecting duct

Question 18

suggest why the transplated kidney is placed in the lower abdomen instead of in the kidney’s usual location

Answer 18

nearer to bladder
easier access