(a) In dialysis blood is filtered periodically through an artificial kidney.
(b) In the event of kidney failure

(a) Part 1: Kidney
Part 2: Ureter
Part 3: Urinary Bladder
Part 4: Urethra
(b) Function of 1 (Kidney): Helps in filtration of blood. Function of 3 (Urinary Bladder): Receives and collects urine from kidneys.

Valves in veins maintains flow of blood only in one direction i.e., from body organs to heart.

Platelets help in clotting of blood when we get injured and thus bleeding is stopped. In their absence we will bleed excessively which may endanger our life and prove fatal.

In our heart, the right side and left side is completely separated by a septum. The septum does not allows oxygenated and deoxygenated blood to mix.

The faster heartbeats signify that heart is pumping more blood to the organs as they need increased oxygen and energy supply.

The water in which these organisms live brings them food and oxygen as it enters their bodies.

Exchange of substances between arteries and veins occurs via capillaries.

Kidney is the major excretory organ and nephrons are its functional units.

Blood contains WBC which forms the defense of our body. They eat antigens and fights aganist infections.

Blood is a fluid tissue which connects all the parts of body with each other.

The red coloured pigment of RBC that carries oxygen with it is called haemoglobin.

The heart is located in the chest cavity with its lower tip slightly tilted towards the left.

The circulatory system consists of three major organs, i.e., blood, blood vessels and heart.

Food, water and oxygen are the products that are carried by blood to every part of the body.