excretion in humans (topic 13)

Question 1

excretion

Answer 1

the removal of toxic materials and substances in excess of requirements from organisms.

Question 2

name 3 excretory products

Answer 2

carbon dioxide, urine, sweat

Question 3

describe excretion of carbon dioxide

Answer 3

co2 is one of the products of aerobic respiration, excreted via lungs after being transported there by its dissolved self in blood plasma

Question 4

what is the urinary system

Answer 4

Organ system involved in excretion of urea, and excess salts and water. It includes the kidneys, ureters and urethra.

Question 5

ureter

Answer 5

carries urine to the bladder

Question 6

urethra

Answer 6

carries urine to the outside

Question 7

bladder

Answer 7

temporarily stores urine

Question 8

what does the kidney do

Answer 8

excrete urea, excess water and ions as urine

Question 9

passageway of urine in body

Answer 9

kidney- ureter- bladder- urethra

Question 10

function of liver

Answer 10

assisting the body in taking up amino acids for cellular use
breaking down excess amino acids (deamination)- to produce urea

Question 11

deamination

Answer 11

The removal of the nitrogen-containing part of amino acids to form urea.

Question 12

what is the role of the liver in assimilation

Answer 12

converts amino acids into proteins

Question 13

where is urea formed

Answer 13

in liver, by excess amino acids

Question 14

renal artery vs renal vein

Answer 14

renal artery- carries blood to the kidney
renal vein- carries blood away from kidney

Question 15

what are the structures in the kidney

Answer 15

cortex, medula, ureter

Question 16

cortex

Answer 16

outer part where blood is filtered and some selective reabsorption happens

Question 17

medulla

Answer 17

inner part where some selective reabsorption happens, and fluid is collected to form urine

Question 18

what are neprhons

Answer 18

structure, in which millions are present in the kidney positioned between the cortex and the medulla

Question 19

what is the role of the nephron

Answer 19

to filter the blood, separating waste and returning substances that are needed back to the bloodstream

Question 20

what is the glomerolous

Answer 20

unit of filtration in the nephron, consists of a network of capillaries
-water, glucose, urea, ions enter tubule (go through glomerolous
-proteins are too big of molecules to pass

Question 21

what is the tubule

Answer 21

Part of a kidney nephron in which selective reabsorption of substances occurs.

Question 22

what substances are reabsorbed in the tubule

Answer 22

all of the glucose
most of the water
some ions.

Question 23

composition of urine

Answer 23

urea, excess water and excess ions

Question 24

what is the importance of excreting urea

Answer 24

it is toxic