excretion in humans

Question 1

what substances do lungs excrete

Answer 1

-carbon dioxide and water vapour
-both formed as a product of cellular respiration

Question 2

what substances do kidneys and bladder excrete

Answer 2

-urine
-urine was formed by kidneys

Question 3

what does urine consist of

Answer 3

-water, mineral salts and waste= urea and uric acid

Question 4

what’s urea

Answer 4

-formed in the liver from deamination of excess of amino acids
-urea is transported by blood to the kidneys

Question 5

what’s urea

Answer 5

-formed in the liver from deamination of excess of amino acids
-urea is transported by blood to the kidneys

Question 6

what’s uric acid

Answer 6

-end product of metabolism of nucleic acid

Question 7

what substances does the liver excrete

Answer 7

-bile pigments and urea

Question 8

what substances does the liver excrete

Answer 8

-bile pigments and urea

Question 9

what are bile pigments

Answer 9

-formed in the liver during breakdown of haemoglobin

Question 10

what substances do alimentary canal excrete

Answer 10

bile pigments

Question 11

what substances do skin excrete

Answer 11

-sweat

Question 12

what does the urinary system consist of

Answer 12

-two kidneys
-two ureters
-one bladder
-one urethra

Question 13

what’s the function of the urinary system

Answer 13

-removed nitrogenous waste from blood stream and regulates water (osmoregulation), salt content and ph of blood

Question 14

what does the renal vein do

Answer 14

-transports deoxygenated blood with waste products out of the kidney

Question 15

what’s the function of the renal cortex

Answer 15

-surrounds renal medulla
-blood is filtered here

Question 16

what’s the function of the renal medulla

Answer 16

-inner part of the kidney
-urines collected here

Question 17

what’s the function of the nephron

Answer 17

-responsible for filtration
-more than 1 million per kidney
-tubular structured that extend from the cortex into medulla

Question 18

what’s the function of the Malpighian body

Answer 18

-starting point of each nephron
-where blood filtration begins

Question 19

what’s the function of the convoluted tubule

Answer 19

-follows malpighian body
-site of reabsorption of useful substances into the blood via peritubular capillaries

Question 20

what’s the function of collecting ducts

Answer 20

-end of each nephron, directs urine to renal pelvis

Question 21

how is urine formed

Answer 21

-filtrate contains waste and excess substances

Question 22

what’s the function of glomerular filtration (ultrafiltration)

Answer 22

-blood enters glomerulus under high pressure due to narrower efferent arteriole

Question 23

what’s tubular reabsorption

Answer 23

-occurs in proximal convoluted tubule

Question 24

what’s tubular excretion

Answer 24

-tubule cells also excrete wastes from the peritubular capillaries into tubules
-this requires ATP