· Web viewNeed for transport: Circulatory system. Homework Questions 1 and 2 refer to the diagram which shows the structure of the lungs. 1.Which label identifies the bronchioles?

Need for transport: Circulatory system. Homework

Questions 1 and 2 refer to the diagram which shows the structure of the lungs.

1. Which label identifies the bronchioles?

2. The function of part A is to

A prevent the lungs from collapsingB keep the trachea open at all timesC prevent food entering the windpipeD trap dirt and bacteria

3. The table below shows some features of blood vessels.


Which line describes features of veins?

4. The table below shows some features of blood vessels.

Which line describes features of arteries?

Direction ofblood flow

Detection of pulse

Presence ofvalves

A towards the heart yes no

B away from the heart no yes

C towards the heart no yes

D away from the heart yes no

Direction ofblood flow

Detection of pulse

Presence ofvalves

A towards the heart yes no

B away from the heart no yes

C towards the heart no yes

D away from the heart yes no


Questions 5 and 6 refer to the diagram below which shows a section through a mammalian heart.

5. Which arrow identifies the vena cava?

A 1B 2C 3D 4

6. Which heart chamber pumps blood to the lungs?


7. The diagram below shows a site of gas exchange in the lungs.

Which line in the table shows the correct relative concentrations of oxygen?

Concentration of oxygenat W at X at Y

A high low highB low high lowC low high highD high high low


Questions 8 and 9 refer to the bar chart below.The bar chart shows the volume of blood supplied per minute to the skeletal muscles and to other parts of the body of a healthy male at rest and during strenuous exercise.

8. There is a difference in the volume of blood supplied per minute to the muscles and to other parts of the body at

rest.

Which statement below is correct?

A 0.5 litre more blood is supplied to the muscles than to other parts of the body.

B 1.0 litre less blood is supplied to the muscles than to other parts of the body.

C 0.5 litre less blood is supplied to the muscles than to other parts of the body.

D 1.0 litre more blood is supplied to the muscles than to other parts of the body.


9. During exercise, the ratio of blood supplied to the muscles to blood supplied to other parts of the body is

A 1 : 4B 4 : 1C 6 : 5D 10 : 3

10. The graph below shows the relationship between the concentration of carbon dioxide and oxyhaemoglobin in

the blood.

Concentration ofoxyhaemoglobin in blood

(%)

Concentration ofCO2 in blood (%)

Which of the following describes this relationship?

A As the carbon dioxide concentration decreases, the concentration of oxyhaemoglobin decreases.

B As the carbon dioxide concentration increases, the concentration of oxyhaemoglobin decreases.

C As the carbon dioxide concentration increases, the concentration of oxyhaemoglobin increases.

D As the carbon dioxide concentration increases, it has no effect upon the concentration of oxyhaemoglobin.

11. (a) The diagram below shows the heart and its valves.


(i) What is the function of valves?

(ii) Give the letters of the two valves which would open as blood leaves the heart.

(iii) At birth some babies have a hole at point X as shown on the diagram. What effect would this hole have on the oxygen concentration of the blood circulating around a baby’s body? Explain your answer.

12. (a) The diagram below shows an air sac and a capillary in the lungs.


(i) Name the process by which oxygen moves from the air sac into the capillary.

(ii) Why is oxygen required by an organism?

(iii) Copy and complete the following sentence using the words ‘high’ or ‘low’.

Oxygen is moving from a ____________ concentration in the air sac to a ______________ concentration in the capillary.

(iv) Name a substance which moves from the capillary into the air sac.

(b) Give two features of the air sacs which make them efficient gas exchange surfaces.


13. The bar graph below shows average blood pressure measurements in different blood vessels for a healthy individual.

(a) Calculate the simple whole number ratio of the blood pressure in the aorta to the blood pressure found in the capillaries.

(b) Calculate the percentage decrease in blood pressure when blood moves from a capillary to a vein.

(c) Explain what brings about the large increase in blood pressure between the vena cava and the aorta.

(d) The blood pressure in veins is very low.

Name the structures in veins that prevent blood flowing backwards.


14. The oxygen concentration of the air decreases as the height above sea level increases.

The table below shows the red blood cell count of a mountaineer taken at different heights above sea level.

(a) On a grid, plot a line graph to show red blood cell count against height above sea level.

(b) (i) From the table, describe the relationship between the height above sea level and the red blood cell count.

(ii) Explain the importance of this change in the red blood cell count.

Height above sea level(metres)

Red blood cell count(millions/mm3 of blood)

200 501000 562200 653600 764800 85


15. The diagram below shows a section through the human heart.

Describe the pathway through the heart and associated structures starting at X and finishing at Y. there is no

need to mention the valves.

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· Web viewNeed for transport: Circulatory system. Homework Questions 1 and 2 refer to the diagram which shows the structure of the lungs. 1.Which label identifies the bronchioles?