Excretion - homeostatic control

Question 1

Excretion and why it is important

Answer 1

Excretion - the process of removing metabolic wastes e.g carbon dioxide and nitrogen based products.
It enables organisms to maintain pH balance and regulate osmotic pressure

Question 2

Structure of liver

Answer 2

Liver lobules are connected to a hepatic vein which takes deoxygenated blood away from the liver is attached to the hepatic portal vein, this controls products of digestion and hepatic artery which supplies oxygenated blood via sinusoid capillaries. And a bile duct transports bile to gall bladder for storage

Question 3

Function of liver

Answer 3

Site of gluconeogenesis, glycolysis, glycogenesis
Stores glycogen
Delaminated excess AA, forming ammonia and organic acids, these can be respired or converted into glycogen. Ammonia is detoxified by addition of CO2 in the ornithine cycle
Detoxifies chemicals e.g converts alcohol to ethanal then acetic acid

Question 4

Examination and drawing to show histology of liver tissue

Question 5

Structure of kidney

Answer 5

Fibrous capsule - protects kidney, cortex - outer region consists of bowman’s capsules, convoluted tubules, blood vessels. Medulla - inner region consists of collecting ducts, loop of Henle, blood vessels

Question 6

Functions of kidney

Question 7

Mechanisms of action for the kidney

Question 8

Dissection and drawing of internal and external structure of the kidney

Question 9

Examination and drawing to show histology of nephrons

Question 10

Control of water potential of the blood

Question 11

Effects of kidney failure and potential treatments

Question 12

How excretory products can be used in medical diagnosis