Homeotasis

Question 1

What needs to be balanced?

Answer 1

Water, temperature, blood glucose concentration and iron content.

Question 2

Removing waste products

Answer 2

The kidneys respond to high levels of water in the blood plasma by reproducing a larger volume of urine which is also more dilute.

Question 3

Kidneys

Answer 3

They filter out small molecules from the blood, water, salts, glucose and urea. They take it out but put back the glucose and re - absorb as much water and salt needed, which makes up urine.

Question 4

Blood glucose

Answer 4

The pancreas produce a hormone called insulin, which causes glucose to move from the blood cells, this is done when blood glucose concentration is too high.

Question 5

Negative feedback

Answer 5

The body senses a change in a variable and activates mechanisms to reverse the changes so that internal conditions within the body are maintained within narrow limits. Eg. Lowering heart rate.

Question 6

Positive feedback

Answer 6

When a change of stimulus occurs, a response that changes the variable even more in the same direction eg. contractions in pregnancy.

Question 7

Hypoglycemia

Answer 7

A state in which the blood glucose level drops below the set point.

Question 8

Glucagon

Answer 8

A hormone formed in the pancreas that promotes the breakdown of glycogen to glucose in the liver

Question 9

Antidiuretic

Answer 9

Affects how much water is reabsorbed into the collecting tubules in the kidneys.