Homeostasis

Question 1

What happens if the blood glucose level is too high

Answer 1

The pancreas secretes insulin. The insulin converts glucose to glycogen. Glycogen is stored in the muscles in the liver

Question 2

What is the only energy source the brain and nervous system use

Answer 2

Glucose

Question 3

What is vasodilation

Answer 3

When it is hot the veins open allowing the blood to go to the surface of the skin

Question 4

What is thermoregulation

Answer 4

Regulating temperature. The hypothalamus in the brain detects most of the changes and initiates the correct response

Question 5

What is piloerection

Answer 5

Hairs stand on end trapping a layer of air keeping the body warm

Question 6

What is urea

Answer 6

Urea is formed in the liver from the breakdown if proteins, it is toxic and is taken to the kidneys in the blood

Question 7

What actions does the body take if you are too hot

Answer 7

Vasodilation
Behavioural changes such as shade, fan, less clothing
Sweating
Hairs lie flat

Question 8

What does your body do if it is too cold

Answer 8

Shivering ( muscle contraction increases respiration and heat is given to the muscles)

Vasoconstriction(blood is kept at core. Less heat lost to environment)

Teeth chattering

Sweat glands reduce sweat

Behaviour-put on clothes

Question 9

What happens if the blood glucose level is too low

Answer 9

Pancreas secretes glucagon. The glucagon converts glycogen into glucose. Glucose is reabsorbed into the blood

Question 10

What is the function of the pituitary gland ?

Answer 10

Its releases adh

Question 11

What is the function of the pancreas ?

Answer 11

It released glucagon and insulin

Question 12

What is the function of the ovaries ?

Answer 12

It releases oestrogen and progesterone

Question 13

What is the function of the testes ?

Answer 13

They release testosterone

Question 14

How does adrenaline affect the body ?

Answer 14

Increase breathing rate
Increase heart rate
Blood is diverted from digestive system to muscles

Question 15

Whats the difference between nervous system and endocrine system

Answer 15

Nervous system :
-electrical messages
-chemical across synapses
-messages travel fast
-very localised effect
Endocrine system :
-chemical messages transferred by blood
-only chemical messages
-longer effect
-slower 
-wide spread effect on the body

Question 16

Describe the nephron and how it works

Answer 16

• blood comes in to via the glomerulus … A net of capillaries
• ultrafiltration in bowmans capsule….the filtrate includes water , salt , urea , glucose and protein
• then there is the convoluted tubes and the loop of henle ….glucose and protein are reabsorbed
• water and salts are reabsorbed in the collecting ductsl