excretion

Question 1

excretion

Answer 1

removal from the body of metabolic waste, toxic materials, and substances in excess of requirements

Question 2

how CO2 excreted

Answer 2

transported to lungs in plasma where it diffuses into air in alveoli and is breathed out

Question 3

how urea is excreted

Answer 3

carried to kidneys in plasma where it is filtered and excreted dissolved in the form of urine

Question 4

glomerulus

Answer 4

clump of blood capillaries which filters urea, glucose, water, and ions from the blood + large molecules like proteins don’t pass through

Question 5

nephron

Answer 5

reabsorption of
- all of the glucose
- most of the water
- some of the ions/salts

Question 6

urine contains

Answer 6

• excess water
• excess salts
• urea

Question 7

deamination

Answer 7

removal of nitrogen containing parts of excess amino acids to form urea

Question 8

assimilation of amino acids in liver

Answer 8

• useful amount is converted to proteins
• excess amino acids broken down into two parts
• urea that’s released into the blood + carbohydrate that’s converted to glycogen + stored

Question 9

deamination process

Answer 9

• excess amino acids can’t be stored so broken into two
• carbohydrate/fat that’s used for energy
• ammonia (NH3) which combines with CO2 to form urea
• urea carried to kidneys where it’s filtered and excreted as urine

Question 10

renal artery

Answer 10

carries oxygenated blood with high urea concentration to kidney

Question 11

renal vein

Answer 11

carries deoxygenated blood from kidney with low urea concentration

Question 12

ureter

Answer 12

tube that runs from kidneys to bladder

Question 13

urinary bladder

Answer 13

• elastic muscular bag
• temporarily stores urine

Question 14

urethra

Answer 14

• tube connected to bladder
• carries urine out of body

Question 15

important to excrete urea because

Answer 15

becomes toxic if allowed to build up in the blood