Human Health and physiology Flashcards
what is the effect of osteoposrosis
bones fragile weak
brittle
less dense
less supportive
what are the first two stages of labour
the uterus contracts
cervix dilates
baby is pushed out through the vagina
what effect does alcohol have on a baby
fetal development system
miscarriage
why are populations of resistant strains od bacteria becoming more common
over use of antibiotics
non resistan strain killed
less competition between non-resistant and resistant straisn
what is the principle fo homeopathy
if large doses can cuase then smaller doses can cure
how are white blood cells adapted to absorb white blood cells
ability to move
detect stimulus
change shape
how did Richard doll carry out the link between smoking and lung cancer
observed large number of people
correlated the incidence of lung cancer and the amount smoking
compared smokers to non smokers
how does the body measure temperature
thermogulatopry centre
skin
why are cancer tumours hot
divide rapidly
therefore high rate of respiration
what were the methods of banting and best
tied pancreatic ducts
enzyme producing cells wither
extract from remaining cells
inject into diabetic dogs
how does temperature effect an enzyme
increases the amount of energy that the molecules have
why can a pulse be detected in an artery and not a vein
artery carries blood away
blood pressure at high pressure
pulse is caused by heart beat and waves of contraction
what happen when you put a cell in pure water
increases in volume
bursts
what happens when you put a cell in sugar solution
decreases in volume
shiverls up
why does a cell burst in pure water
water enters
by osmosis
membrane breals
what does antagonistic mean
when one muscle contracts the other relaxes
a muscle can only move a bone in one way
what is the job of the synovial fluid
lubricates
shock absorber
what is a mutation
what is cancer
abnormal cell division
a change in DNA
what causes cancer
uv
x rays
gamma rays
what is a recessive allele
a form of gene
needs 2 copies to be expressed
which contratcs to strgighten
extensor
which contracts to ben
flexor
benefits of breast feeding
contains all nutriets babies needs
contains antibodies
less likely to become obese
how do you show protein
grind it up
put in burets solution
turn lilac
how does reducing cholesterol maintain a healthy heart
causes atheroma
narrows arteries
avoids heart attack
what is a reflex action
an response to a stimuli that is automatic
how does the iris reduce the light entering the eye
the muscle contractws reducing the size of the pupil
what causes lung caner
chemicals from the smoke are more conenctrated in the lungs,
enter lungs first
how does cancer get to other area
the chemicals are carried by the blood
what is a pathogen
a microorganism that causes disease
how does a scab form
enzyme
fibrogen to fibrin
meshwork fibres
blood cells trapped
why do antibodies only fit one area
specific shape
fits only one type on antigen
how does dialysis work
blood flows between partially permeable memebrane ideal concentration 2 things leave the blood by diffusion until balanced
