What is Stethoscope ?
A doctor uses the stethoscope as a device to amplify the sound of the heart.
Class 7
Heart beat
The walls of the chambers of the heart are made up of muscles. These muscles contract and relax rhythmically. Thisrhythmic contraction followed by its relaxation constitute a heart beat.
Heart
The heart is an organ which beats continuously to act as a pump for the transport of blood.The heart is located in the chest cavity with its lower tip slightly tilted towards the left . Heart like fist. Your heart is roughly the size of your fist. the heart has four chambers. The two upper …
Blood Donation
Hundreds of people die due to unavailability of blood. Voluntary blood donation is harmless and painless and can save precious lives. Blood can be donated at hospitals and other places authorised by the government. Donated blood are stored with special care in Blood Banks.
What is capillaries ?
On reaching the tissues, Arteries and Vein divide further into extremely thin tubes called capillaries. The capillaries join to form veins which empty into the heart.
What is vein ?
Veins are the vessels which carry carbon dioxide-rich blood from all parts of the body back to the heart. The veins have thin walls. There are valves present in veins which allow blood to flow only towards the heart.
Pulse rate in human
The number of beats per minute is called the pulse rate. A resting person, usually has a pulse rate between 72 and 80 beats per minute
Pulse
Throbbing movement of blood is called the pulse and it is due to the blood flowing in the arteries.72 pulse beats in one minute.
Blood vessels
, Two types of blood vessels, arteries and veins are present in the body. Arteries carry oxygen-rich blood from the heart to all parts of the body. Since the blood flow is rapid and at a high pressure, the arteries have thick elastic walls.
BLOOD
One type of cells are the red blood cells (RBC) which contain a red pigment called haemoglobin. Haemoglobin binds with oxygen and transports it to all the parts of the body and ultimately to all the cells. The blood also has white blood cells (WBC) which fight against germs that may enter our body. The …