Topic 5 - Homeostatis and Response

homeostatis

maintenance of a constant internal environment

what needs to be kept constant in a body

blood glucose

water

temperature

CNS function

sends signals

cerebral cortex

intelligence / memory

cerebellum

movement and balance

medulla

controlls heartbeat / breathing / blood pressure

sclera

protects the eye

retina

where the image is focused

optic nerve

sends messages to brain

cillary muscles

change the shape of the lens

cornea

protective covering

pupil

Lana Del Rey - Let The Light In ft. Father John Misty

lens

to focus

suspensory ligaments

hold lens in place

short sighted (myopia) people

can’t see distant objects

short sighted people : the image is focused _____ the retina

before

to correct short sightedness (myopia) you need a

diverging lens

where in the brain is temperature regulated

thermoregulatory centre

too cold : what will the body do?

hairs will stand up (trap layer of air)

stop sweating

vasoconstriction (less heat loss)

muscles will shiver

too hot : what will the body do?

hairs lie flat

sweating

vasodilaton

where is pancreas

behind the stomach

thyroxine enables

metabolism rate

type 1 diabetes

pancreas doesn’t work properly (produces incorrect amount of insulin)

type 2 diabetes

cells become insensitive to insulin

symptoms of diabetes

weight loss

increased need to wee

thirst

blurry vision

fatigue

treatment for diabetes

insulin injections

kidney function

control urea

control ion content

water content

ultrafiltration

blood enters kidneys under high pressures

reababsorption

as stuff flows along the nephron, useful items are reabsorbed

what is reabsorbed in the kidneys

all sugars

some ions

some water

fsh

matures the egg

oh

release the egg

progesterone

maintains the lining of the uterus

progesterone inhibits

FSH and LH

oestrogen causes a surge in

LH