(a) plasma
(c) white cells
B. Answer the following questions:
1. Write three main functions of the blood.
2. What is a heart beat?
3. What is a pulse ?
4. answerWhat is the effect of running on your heart beat?
5. What is the difference between an artery and a veins
6. How many times your heart beats per minute ?
7. What is blood composed of ?
8. How does blood clot at the sight of injury?
9. How does heart beats increase ?
10. How does heart take rest?
Answers
Answer:
Plasma - plasma is a yellowish liquid component of blood that holds the blood cells of whole blood in suspension. The main role of plasma is to take nutrients, hormones, and proteins to the parts of the body that need it.
White 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.
Blood - a) Transport
b) Protection
c) Regulation.
Heart beat - The walls of the chambers of the heart are made up of muscles. These muscles contract and relax rhythmically. This rhythmic contraction followed by its relaxation constitute a heartbeat.
Pulse- Pulse refers to a pressure wave that expands and recoils the artery when the heart contracts/beats
4) Answer- During cardio exercise such as running, your heart rate increases
Arteries Veins
a) Have thick walls a) Have thin w walls
b) Carries pure b) Carries im-
blood. pure blood.
6) Answer- 60 to 100 beats per minute.
7) Answer- Blood is composed of plasma, red blood cells ( RBC), White blood cells( WBC), blood platelets.
8) Answer- Blood platelets in the bloodstream, known as thrombocytes, attach to the damaged area of the blood vessel and clump together to reduce the bleeding.
9) Answer- our heart beats faster when we do exercise like running, jumping etc.
10) Answer- When the heart beats, it pumps blood to your lungs and the rest of your body. But in between beats, the heart muscle relaxes as it fills with blood. It relaxes only for a moment after each contraction, but that still counts as resting.
Hope it helps you!!