Excretion Flashcards
what 2 waste gases do PLANTS produce and what processes produce them?
oxygen is produced as a waste product of photosynthesis
carbon dioxide is produced as a waste product of respiration
what is the general structure of a kidney?
renal artery carries blood to the kidney
renal vein carries blood away from the kidney
each kidney contains nephrons
ureter carries fluid from the kidney to the bladder
what is the function of the kidneys?
- to regulate the volume and concentration of urine
- to remove waste and regulate body water
give 3 waste products produced in the body
- urea
- carbon dioxide
- excess salt and water
name 3 excretory organs
- the lungs - water and carbon dioxide
- the kidneys
- the skin - sweat through sweat glands
give three metabolic waste products in plants
- oxygen
- carbon dioxide
- water/water vapour
define the term metabolism
the chemical reactions that occur inside living cells
Which metabolic process in PLANTS produces carbon dioxide as a waste product?
respiration
How does light intensity affect waste product accumulation in plants?
the light intensity determines which gas is formed as a waste product
at high light intensity more photosynthesis occurs resulting in a rise of oxygen
while at low light intensity more respiration occurs so carbon dioxide builds up
what is likely to be the main waste product in plants during daylight hours?
during the day when there is sufficient light for photosynthesis
oxygen is produced in excess and is the main waste product
which plant structure allows gaseous waste products to exit the leaves?
stomata
name the process by which gaseous waste products exit the leaves of plants?
diffusion
define the term excretion
excretion is the removal of waste products of metabolism from the body, and any substances present in excess e.g excess salts
what happens if the BODY cells lose water by osmosis?
causes the cells to shrink or shrivel which can lead to inefficiency of cell activity and potentially cell death
name 2 processes that will cause an increase in water content of the body fluids
aerobic respiration
consumption of water by eating or drinking
name the organ system that filters the blood and produces urine?
urinary system
consists of the kidney, ureters, bladder and urethra
what is the tube that connects the kidney to the bladder?
ureters
what is the role of the bladder in the urinary system?
stores urine that is produced by the kidneys
urine exits the bladder via the urethra which removes it from the body
what are nephrons?
tiny tubes found in the kidney, they produce urine
what is ultrafiltration?
the process by which molecules are forced out of the blood and into the bowman’s capsule at high pressure
during ultrafiltration
glucose
water
urea
salts
are forced out of the capillaries
what are the three main components of urine?
urea - formed during the breakdown of excess amino acids from protein digestion
water
ions
