excretion Flashcards
why glucose is not normally found in urine
it is reabsorbed in the proximal convoluted tubules
suggest two situations in which urine volume ids likely to be low
dehydration, during hot weather
name the hormone involved in lowering the volume of urine
anti diuretic hormone (ADH)
name one part of the nephron affected by the hormone ADH
collecting duct
explain excretion
removal of metabolic waste form a cell
explain homeostasis
maintain a constat internal environment
name one excretory organ in plants
leaf
where does the process of filtration occur
cortex
explain the importance of blood entering the glomerulus under pressure
force filtered
state two reasons why there are many capillaries surrounding the proximal consulted tube loop of hence and distal converted tube of the nephron
reabsorption, secretion
describe how ADH affects the volume of urine
more water is reabsorbed
name the structure through which the urine travels tot he bladder
ureter
which structure in the skin is involved in vasoconstriction
arteriole
describe in detail the role of vasoconstriction in temperature regulation
in cold conditions, arterioles narrow and less heat is loss
which structure in the skin is involved in piloerection
hair
what structure in the skin is involved in both excretion and temperature regulation
sweat gland
name the excretory product prduced by the sweat gland
sweat
humans can generate their own heat and regulate their own body temperature, what name is given to such organisms
endotherm
name two other systems in which the skin has a role
nervous, defence
state the precise location in the body where urea is made
liver
name the food biomolecule from which urea is derived
protein
in which part of the kidney is the Bowmans capsule located
cortex
in which part of the kidney is the loop of hence located
medulla
what chance in blood composition triggers the secretion of ADH
increased salt concentration
name the endocrine gland in epoch ADH s produced
hypothalamus
explain egestion
removal of undigested waste
suggest how excretion may occur in simple organisms such as amoeba
diffusion
name two excretory proud cats other than water of mammals
carbon dioxide, urea
for each product give a location in the body in which it is proud ced
carbon dioxide - lungs
urea - liver
suggest two structures in flowering plants which play a role in excretion
stomata, lenticels
define piloerection
hair stands up, this traps air close to the skin which reduces heat loss
define vasoconstriction
blood vessels narrow reduction heat loss
name the blood vessel that supplies blood to the kidney
renal artery
from which blood vessel does renal artery arise from
aorta
in which cavity of the body is kidney located in
abdomen
name one substance excreted in urine
salt
give a feature of a kidney which indicates that it is an exocrine glands
ducts
