biology 

Systole is the contraction phase of the cardiac cycle. Diastole is the relaxation phase of the cardiac cycle. The heartbeat plays a key role in blood circulation.

Blood is the body fluid and the Plasma is only a component in the blood. Both the blood and plasma is very important for a person to live a healthy life………

The nutrients and water, sugar substances are transported from the roots to all the parts of the plant by the tissues called xylem and phloem Xylem and Phloem are the parts of the vascular bundle.

Central nervous system (CNS) Controls the voluntary functions like walking, laughing, reading, etc. and Peripheral nervous system (PNS) is responsible for the involuntary actions like blinking of eye, heartbeat, digestion of food, etc.

Some of these wastes are harmful to body and are removed from the body through excretion and secretion. The process of excretion is passive in nature. The process of secretion is active in nature.

The natural kidneys are responsible for the excretion of nitrogenous waste products produced in the body. Artificial Kidney is the man made a device to replace the kidney in case of kidney failure in humans.

The cells present in the Proximal Convoluted Tubule (PCT) have brush border which is capable of absorption. Distal Convoluted Tubule (DCT) is the highly coiled part found in the medulla of the kidney.

Small Intestine And Large Intestine present in the stomach plays a major part in digestion of food and the absorption of water, minerals, vitamins, etc to the body.

The sperm and Ovum plays an important role in fertilization. Production of sperm starts only after the puberty in males. Production of Ovum may start after birth, but ova Will be matured after puberty.

Mitosis and Meiosis are the two phases of the nuclear cell division. There are four phases in mitosis, four phases in meiosis-1 and another four phases in meiosis-2 which results in the successful cell division.