excretion

Question 1

why glucose is not normally found in urine

Answer 1

it is reabsorbed in the proximal convoluted tubules

Question 2

suggest two situations in which urine volume ids likely to be low

Answer 2

dehydration, during hot weather

Question 3

name the hormone involved in lowering the volume of urine

Answer 3

anti diuretic hormone (ADH)

Question 4

name one part of the nephron affected by the hormone ADH

Answer 4

collecting duct

Question 5

explain excretion

Answer 5

removal of metabolic waste form a cell

Question 6

explain homeostasis

Answer 6

maintain a constat internal environment

Question 7

name one excretory organ in plants

Answer 7

leaf

Question 8

where does the process of filtration occur

Answer 8

cortex

Question 9

explain the importance of blood entering the glomerulus under pressure

Answer 9

force filtered

Question 10

state two reasons why there are many capillaries surrounding the proximal consulted tube loop of hence and distal converted tube of the nephron

Answer 10

reabsorption, secretion

Question 11

describe how ADH affects the volume of urine

Answer 11

more water is reabsorbed

Question 12

name the structure through which the urine travels tot he bladder

Answer 12

ureter

Question 13

which structure in the skin is involved in vasoconstriction

Answer 13

arteriole

Question 14

describe in detail the role of vasoconstriction in temperature regulation

Answer 14

in cold conditions, arterioles narrow and less heat is loss

Question 15

which structure in the skin is involved in piloerection

Answer 15

hair

Question 16

what structure in the skin is involved in both excretion and temperature regulation

Answer 16

sweat gland

Question 17

name the excretory product prduced by the sweat gland

Answer 17

sweat

Question 18

humans can generate their own heat and regulate their own body temperature, what name is given to such organisms

Answer 18

endotherm

Question 19

name two other systems in which the skin has a role

Answer 19

nervous, defence

Question 20

state the precise location in the body where urea is made

Answer 20

liver

Question 21

name the food biomolecule from which urea is derived

Answer 21

protein

Question 22

in which part of the kidney is the Bowmans capsule located

Answer 22

cortex

Question 23

in which part of the kidney is the loop of hence located

Answer 23

medulla

Question 24

what chance in blood composition triggers the secretion of ADH

Answer 24

increased salt concentration

Question 25

name the endocrine gland in epoch ADH s produced

Answer 25

hypothalamus

Question 26

explain egestion

Answer 26

removal of undigested waste

Question 27

suggest how excretion may occur in simple organisms such as amoeba

Answer 27

diffusion

Question 28

name two excretory proud cats other than water of mammals

Answer 28

carbon dioxide, urea

Question 29

for each product give a location in the body in which it is proud ced

Answer 29

carbon dioxide - lungs
urea - liver

Question 30

suggest two structures in flowering plants which play a role in excretion

Answer 30

stomata, lenticels

Question 31

define piloerection

Answer 31

hair stands up, this traps air close to the skin which reduces heat loss

Question 32

define vasoconstriction

Answer 32

blood vessels narrow reduction heat loss

Question 33

name the blood vessel that supplies blood to the kidney

Answer 33

renal artery

Question 34

from which blood vessel does renal artery arise from

Answer 34

aorta

Question 35

in which cavity of the body is kidney located in

Answer 35

abdomen

Question 36

name one substance excreted in urine

Answer 36

salt

Question 37

give a feature of a kidney which indicates that it is an exocrine glands

Answer 37

ducts