The passage of water across a selectively permeable membrane is called osmosis.

The drooping of leaves due to loss of turgor pressure at noon and recovery in the evening is called temporary wilting.

In mammals, the urea is transported by haemoglobin.

Heart of a fish is special because it only has venous blood.

Mammalian erythrocytes have short lifespan due to absence of nucleus.

Blood capillaries are made of endothelium only.

The transparent yellowish fluid containing dissolved waste released from the kidney is known as urine. It is released from the kidney and passes through tubes called ureters. It is temporarily stored in the urinary bladder and is finally thrown out through a muscular tube called urethra.

Blood is a fluid flowing in blood vessels. It has its several components. Its several components are plasma, red blood cells, white blood cells and the platelets. The fluid part of the blood is known as plasma. Blood is red in colour due to the presence of a pigment called haemoglobin.

If there is any cut or wound, the platelets of blood reach the surface and plug in the wound by clotting blood at that place. Therefore, platelets help in the healing of wounds by blood clotting.

All veins except the pulmonary vein carry deoxygenated blood. The pulmonary vein carries oxygenated blood from lungs to the heart and then supplies it to all body parts.

Heart is located in the chest region and the cavity is known as chest cavity. The lower tip of the heart lies slightly tilted towards the left.

Stethoscope is an instrument which amplifies sound and is used for listening a person's heartbeat or breathing.

Animals such as sponges and hydras do not possess any circulatory system. The water in which they live acts as circulatory fluid for them. This is because it brings food and oxygen into their bodies.

Ammonia, urea and uric acid are the excretory products in different animals. Ammonia is an excretory product in gaseous form in fishes. On the other hand, uric acid (white in colour) is in birds, lizards, snakes etc. Urea is an excretory product in the human beings.

In plants, water and minerals are moved upward through suction pull via xylem from the roots to all parts of the plant. Food synthesised in the leaves is transported to all parts of the plant by phloem.