Question

definition of the following:-

1) pulse
2) pulse rate
3) blood
a} RBC
b} WBC
4) blood vessels
a} arteries
b} veins


FROM CBSE CLASS 7 SCIENCE BOOK ONLY


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Answer 1

Answer:

rhythmical throbbing of the arteries as blood is propelled through them, typically as felt in the wrists or neck.

Pulse rate is the number of heartbeats per minute. The resting pulse rate for an average adult is between 60 and 80 beats per minute.

the red liquid that circulates in the arteries and veins of humans and other vertebrate animals, carrying oxygen to and carbon dioxide from the tissues of the body.

RBC: Short for red blood cells, the cells that carry oxygen and carbon dioxide through the blood. ... RBC also stands for the red cell count, the number of red blood cells in a given volume of blood. The normal range varies slightly between laboratories but is generally between 4.2 - 5.9 million cells/cmm.

White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells.

There are five types of blood vessels: the arteries, which carry the blood away from the heart; the arterioles; the capillaries, where the exchange of water and chemicals between the blood and the tissues occurs; the venules; and the veins, which carry blood from the capillaries back towards the heart

any of the muscular-walled tubes forming part of the circulation system by which blood (mainly that which has been oxygenated) is conveyed from the heart to all parts of the body.

any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood towards the heart

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Answer 2

pulse .The rhythmic dilation of an artery that results from beating of the heart. Pulse is often measured by feeling the arteries of the wrist or neck.

Pulse rate is the number of heartbeats per minute. The resting pulse rate for an average adult is between 60 and 80 beats per minute.

Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells.

RBC red blood cells- blood cells

Red blood cells: The blood cells that carry oxygen. Red cells contain hemoglobin and it is the hemoglobin which permits them to transport oxygen (and carbon dioxide).

white blood cells _ White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells.

blood vessels_ The blood vessels are the components of the circulatory system that transport blood throughout the human body. These vessels transport blood cells, nutrients, and oxygen to the tissues of the body. They also take waste and carbon dioxide away from the tissues.

arteries _ The arteries are the blood vessels that deliver oxygen-rich blood from the heart to the tissues of the body. Each artery is a muscular tube lined by smooth tissue and has three layers: The intima, the inner layer lined by a smooth tissue called endothelium

veins_ Veins are blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. In contrast to veins, arteries carry blood away from the heart.