Circulatory system

Question 1

What are the functions of the Circulatory system?

Answer 1

1) helps defend the body against infection
2) collect waste substances and carry it to the excretory organs
3) Transport blood throughout the body

Question 2

The central component of the circulatory system is the

Answer 2

Heart

Question 3

Why is oxygenated blood pumped at high pressure?

Answer 3

To drive the blood out from the heart and the way down to the legs and arms

Question 4

What blood vessel carry blood back to the heart

Answer 4

Veins

Question 5

The parts that act like doors and control blood flow are called valves. True or False

Answer 5

True

Question 6

The heartbeat occurs because the blood is traveling in opposite directions. True or False

Answer 6

False

Question 7

Both oxygenated and deoxygenated blood flow to the heart. True or False

Answer 7

True

Question 8

Heart muscles do not get tired. True or False

Answer 8

True

Question 9

The septum allows free blood flow across the sides of the heart

Answer 9

False

Question 10

The heart can live outside the body

Answer 10

False

Question 11

Give two features of Arteries

Answer 11

(Any two work)
1)Transport blood away from the heart to body tissues and organs
2)Blood flows through under high pressure
3)Blood moves in pulses created as the ventricles contract
4)Blood flows rapidly
5)Blood is oxygenated except in the pulmonary artery
6)Most lie deep within the body so they are protected
7)Do not possess valves, except the aorta and the pulmonary artery as they leave the ventricles of the heart

Question 12

Give two features of Capillaries

Answer 12

(Any two work)
1)Transport blood throughout all body tissues and organs, linking arteries to veins
2)Blood flows through under low pressure
3)Blood flows smoothly
4)Blood flows very slowly
5)Blood becomes deoxygenated as it travels through capillaries
6)Run throughout all tissues and organs
7)Do not possess valves

Question 13

Give two features of Veins

Answer 13

(Any two work)
1)Transport blood back towards the heart from body tissues and organs
2)Blood flows through under low pressure
3)Blood flows smoothly
4)Blood flows slowly
5)Blood is deoxygenated, except in the pulmonary vein
6)Many lie close to the body surface
7)Possess valves to prevent the low-pressure, slow-flowing blood from flowing backward

Question 14

The inner diameter of arteries is small because the walls are very thick. True or False

Answer 14

True

Question 15

Diffusion through capillary walls is easy because capillaries are one cell thick. True or False

Answer 15

True

Question 16

After diffusion occurs, the capillary walls die and are dissolved into the bloodstream. True or False

Answer 16

False

Question 17

Venules join and connect to veins. True or False

Answer 17

True

Question 18

All arteries carry blood to the heart. True or False

Answer 18

False

Question 19

Say which blood vessels contain valves. Explain what these valves do and why they are needed

Answer 19

The veins contain valves and these valves are needed to ensure the blood flows in one direction

Question 20

Name 4 components of blood

Answer 20

RBC, WBC, Platelets, plasma

Question 21

Name the type of cell found in the blood that has the shape of a biconcave disc and contains a protein called haemoglobin/hemoglobin

Answer 21

RBC

Question 22

State one function of RBC

Answer 22

Transport oxygen

Question 23

Name the component of blood that is essential for the clotting of blood

Answer 23

Platelets

Question 24

What are the 2 types of WBC?

Answer 24

Lymphocytes and Phagocytes

Question 25

State the function of each WBC

Answer 25

Lymphocytes-Produces antibodies to get rid of pathogens
Phagocytes-Engulfs/Encloses the pathogens and kills it