Junior Science Biology: Chapter 25 Circulatory System in Animals

1) The following shows a model of the human respiratory system.

a) What are represented by the following parts?

i) Glass tube : __________________________________

ii) Balloons : __________________________________

iii) Bell Jar : __________________________________

iv) Rubber Sheet : __________________________________

b) Name the process that occurs when the rubber sheet is pulled upwards.

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c) Name the process that occurs when the rubber sheet is pulled downwards.

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Junior Science Biology: Chapter 25 Circulatory System in Animals

2) Diagram below shows the cross section view of a human heart.

a) Label A to O.

b) What is the role of the heart in the human circulatory system?

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c) State the differences between N and O.

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d) State the function of H.

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e) What is the function of the valves in human heart?

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A

B

C

D

E

F

H

IB

JB

K

LB

M

MNO

G

Junior Science Biology: Chapter 25 Circulatory System in Animals

f) Which part of the human heart divides the left and right ventricles?

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g) Which of the labelled parts carry oxygenated blood?

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h) Which of the labelled parts carry deoxygenated blood?

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i) Name the valve that separates C and F.

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j) Which two chambers of the heart contain oxygenated blood?

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k) Which two chambers of the heart contain deoxygenated blood?

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Junior Science Biology: Chapter 25 Circulatory System in Animals

3) The following shows the human circulatory system.

a) Name the followings:

i) Vessel A : ___________________________________

ii) Vessel B : ___________________________________

iii) Vessel C : ___________________________________

iv) Vessel D : ___________________________________

b) What is the function of organ X?

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c) State one important characteristic of organ X and explain how it helps to facilitate gaseous

exchange.

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Organ X

Vessel A

Vessel B

Vessel C

Vessel D

Junior Science Biology: Chapter 25 Circulatory System in Animals

d) When blood flows from Vessel B to Vessel D, how will the concentration of carbon dioxide in the blood change? Why?

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e) Which of the blood vessels carry deoxygenated blood towards the heart?

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f) State the function of Vessel D.

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g) Which is the strongest chamber in a human heart? What is its function?

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