14.4 Homeostasis

Define homeostasis

maintenance of const. internal environment

How does homeostasis occur?

controlling internal conditions within set limits

Define negative feedback

change causes response that reverses change

Example of homeostasis/negative feedback in humans

maintains const body temp for enzymes

What detects if the body is too hot/cold?

blood temp receptors

Too hot: response
> s__ glands make s__

Effect
e__ = cooling

sweat, sweat, evaporates

Too hot: response
> arterioles __ (v__)

Effect
↑b__ flow → s__ surface = heat l__ via r__ = redder

dilate, vasodilation, blood, skin, loss, radiation

Too cold: response
> s__ (a__ respiration in muscles c__)

Effect
h__ energy

shivering, aerobic, contracting, heat

Too cold: response
> arterioles __ (v__)

Effect
↓b__ flow → skin surface = ↓h__ loss via r__

constrict, vasoconstriction, blood, heat, radiation

Too cold: response
> h__ e__ muscles contract (pulled up)

Effect
t__ layer of i__ air

hair erector, traps, insulated

Blood glucose levels too high

Pancreas detects changes

Pancreas secretes __

secreted → l__

Gl__ → gl__

insulin, liver, glucose, glycogen

Blood glucose levels too low

Pancreas detects changes

Pancreas secretes __

secreted → l__

Gl__ → gl__

glucagon, liver, glycogen, glucose

I__ will __(incr/dec) blood sugar levels

G__ will __(incr/dec) blood sugar levels

insulin, dec, glucagon, incr

What is type 1 diabetes?

pancreas makes 0/little insulin = cant regulate blood sugar levels = high levels

Symptoms of type 1 diabetes
> ↑__, __

thirst, urine

Type 1 diabetes treatments
> i__ i__
> m__ blood glucose conc
> h__, balanced d__
> e__

insulin injection, monitoring, healthy, diet, exercise

What is this?

hair

What is this?

receptors

What is this?

sensory neurones

What is this?

hair erector muscle

What is this? (upper)

blood capillary

What is this?

sweat gland

What is this? (lower)

arteriole

What is this?

fatty tissue