Blood consists of plasma, RBC, WBC and platelets. Blood is red due to the presence of a red pigment, haemoglobin.
The transport system of humans comprises blood vessels, blood, and a four-chambered heart.
Circulatory system consists of the heart and blood vessels.
In humans, blood flows through arteries and veins and the heart acts as a pumping organ.
The human urinary system comprises the kidneys, ureters, urinary bladder, and urethra.
Several wastes are created inside a living body, which must be excreted for efficient functioning of the body and prevention of diseases.
Human beings excrete their body wastes through lungs (carbon dioxide), skin (sweat), anus (faeces), and through the urinary system (urine).
Plants excrete their toxic wastes in the form of resins, gums, etc.
In most animals the blood that circulates in the body distributes food and oxygen to different cells of the body. It also carries waste products to different parts of the body for excretion.
Nutrients are transported along with water to the entire plant via the vascular tissue called xylem.
The vascular tissue for the transport of food to the various parts of the plant is phloem.
A lot of water is lost by plants in the form of vapour through stomata during transpiration.
Transpiration generates a force which pulls up water absorbed by the roots from the soil, to reach the stem and leaves.
Water and mineral nutrients are absorbed by roots from the soil.
Birds, insects and lizard excrete uric acid in semi-solid form.
