Edexcel GCSE Biology Topic 7 Animal coordination, control and homeostasis overview quiz quiz

Along nerves

Through the air

In the blood

In the bones

The thyroid gland in the neck

The pancreas near the gut

The pituitary gland

The adrenal glands

It inhibits TRH and TSH, so less thyroxine is made and the level falls

It increases TRH and TSH even further, so the thyroid makes still more thyroxine

It has no effect at all on the level of thyroxine in the blood

It stops the heart beating until the thyroxine level returns to normal

FSH

LH

Progesterone

Insulin

It chemically kills any sperm that reach the egg, so fertilisation can never take place

It physically removes the uterus so a fertilised egg has nowhere to implant

It contains hormones that inhibit FSH, so no egg matures and ovulation is prevented

It works only by protecting against sexually transmitted infections, not pregnancy

Glucagon, in the liver

Adrenalin, in the kidney

Oestrogen, in the ovary

Insulin, in the pancreas

Glucagon makes the liver release glucose from glycogen

Insulin is released and makes the body cells take up even more glucose

Nothing happens, because the body cannot detect a low blood glucose level

The pancreas stops working until glucose is eaten in food again

The body's cells gradually stop responding to the insulin produced

The pancreas does not produce enough insulin

Doing far too much exercise over many years

A lack of glucagon from the pancreas

40

160

20

10

Narrows the skin blood vessels to keep heat trapped deep inside the body

Stops sweating completely so that less water is lost from the warm skin

Makes the tiny hairs on the skin stand up to trap a layer of warm air

Widens the skin blood vessels so more heat is lost at the surface

More ADH is released, more water is reabsorbed, and concentrated urine is made

Less ADH is released, less water is reabsorbed, and a large volume of dilute urine is made

ADH adds water straight into the blood from the gut without involving the kidneys at all

ADH has no effect on the kidney, so the urine stays exactly the same when you are dehydrated

In the kidney itself, as it filters the blood and makes urine

In the liver, from excess amino acids

In the lungs, as a waste gas removed when you breathe out

In the muscles, as a waste product made during exercise