The circulatory system is a transport system of the human body that consists of a network that supplies food, water, oxygen, and other substances throughout the body. Blood is an important part of a transport system that flows in our body through the blood vessels. The blood contains blood plasma, red blood cells, white blood cells, and platelets. The heart is an organ that beats continuously to act as a pump. It transports blood, which carries other substances within it. Removal of waste is essential for our body, it is known as excretion.  We will also learn about how water and minerals are transported in plants.

Blood is fluid which flows in vessels of the human body. It is composed of a fluid called plasma. The color of blood is red because it contains hemoglobin. Do you know Vitamin K is used by the body to help in blood clots? The main parts of the circulatory system are Blood, Blood Vessels, and Heart. 

Our body contains tube-like structures called blood vessels. There are two types of blood vessels: Arteries and Veins. Arteries carry oxygen-rich blood from the heart to all parts of the body and veins carry blood that is rich in Carbon dioxide from the body organs to the heart. We will understand in detail this virtual tour activity.

The heart is located in the chest cavity, between our lungs, slightly tilted towards the left side. The heart has four chambers. It helps to supply oxygen and nutrients to the tissues and remove carbon dioxide and other wastes. Do you know your heart is approximately equal to the size of your fist? We will explore more such facts in this activity.

The excretory system removes the excess and unnecessary materials from the body fluids of an organism. The excretory system consists of the kidneys, two ureters, the urinary bladder, and the urethra. It maintains internal chemical homeostasis and prevents the body from damage.

We have learned in previous chapters that the plant takes water and minerals from the soil by its roots. But how are minerals transported in plants? Well, water and minerals are transported to all parts of the plant via vascular tissue called the xylem. The food is transported to all parts of the plant via the vascular tissue known as phloem.