T3 BAB 1

Respiration

1. A group of students built a model of the human respiratory system to investigate the mechanism of breathing in and breathing out.

Which of the following pairs is correct?

A

B

C

D

Model of respiratory system Human respiratory system.Balloon .Rubber sheet.Bell jar

.Lungs

.Diaphragm

.Thoracic cavity.Rubber sheet.Air space inside bell jar.Balloon

.Diaphragm

.Thoracic cavity

.Lungs.Rubber sheet.Balloon.Bell jar

.Lungs

.Diaphragm

.Thoracic cavity.Balloon.Air space inside bell jar .Rubber Sheet

.Thoracic cavity

.Rib cage

.Diaphragm

(PMR 2004)

2. The diagram shows part of the human respiratory system.

What will happen when structure x contracts and becomes flattened?

A Air from outside enters the lungs

B The rib cage goes down inwards

C The volume of the thorax cavity decreases

D Air pressure inside the thorax cavity increases

(PMR 2005)

3. Which features help gas exchange between the alveolus and capillaries to take place efficiently?

ABCD

Alveolus wall Number of blood capillariesThickness Condition

ThickThinThickThin

MoistMoistDryDry

A fewManyA fewMany

(PMR 2006)

4. Diagram 17 shows the passage of air through the human respiratory system while exhaling.

Diagram 17

Which of following represents X, Y and Z?

ABCD

(PMR 2006)

X Y ZTrachea Bronchus Bronchioles

Bronchioles Trachea BronchusBronchus Trachea Bronchioles

Bronchioles Bronchus Trachea

K- Oxyhaemoglobin breaks into oxygen and hemoglobin

L- Oxygen diffuses through alveoli into the blood capillaries

M- Oxygen combines with hemoglobin to form oxyhaemoglobin

N- Oxyhaemoglobin is transported to all parts of the body

5. The following statements are about the transportation of oxygen in the human body.

Which of the following is the correct sequence of the transportation?

A. M, K, L, N

B. K, L, M, N

C. N, K, L, M

D. L, M, N, K

(PMR 2007)

6. Diagram 15 shows the structure of human lungs.

Q

P R

S

Diagram 15

Which of the following is represented by P, Q, R and S?

P Q R SA Alveolus Bronchus Trachea BronchioleB Trachea Bronchus Bronchiole AlveolusC Trachea Alveolus Bronchiole BronchusD Alveolus Bronchiole Trachea Bronchus

(PMR 2008)

1 Figure 1.1 shows a model of the lungs to study the human breathing mechanism.(PMR 2005)

Figure 1.1

(a) Using the model, explain the process of inhalation.

…………………………………………………………………………………………

…………………………………………………………………………………………

………………………………………………………………………………………….( 2 marks)

(b) Figure 1.2 shows a model of the lungs and a human respiratory system. On Figure 1.2 draw lines to match the parts of the model with the part of the human respiratory system

( 2 marks)

Figure 1.2

(c) Figure 1.3 shows the structure of some alveoli and blood capillaries.

Figure 1.3

Explain the transportation of oxygen gas to the body cells, starting from the alveolus.

…………………………………………………………………………………………

…………………………………………………………………………………………

…………………………………………………………………………………………

…………………………………………………………………………………………( 3 marks)

(d) Smoking is dangerous to human health. State one reason.

……………………………………………………………………………………..….

………………………………………………………………………………………….( 1 mark)

2 Diagram 2.1 shows a human respiratory system. ( PMR 2006)

Diagram 2.1

(a) Using the letters in diagram 2.1 complete the diagram below to show the air flow during inhalation.

( 2 marks)

(b) What will happen to structure K during the process of exhalation?

…………………………………………………………………………………………

…………………………………………………………………………………………( 1 mark)

(c) Diagram 2.2 shows a worker in a cement factory wearing a mask.

Diagram 2.2

What is the effect on the lungs of the worker if he neglects to wear the mask while working?

…………………………………………………………………………………………

…………………………………………………………………………………………( 1 mark)

(d) Diagram 2.3 shows the structure of an alveolus.

Diagram 2.3

The process of gaseous exchange happens between the alveolus and the blood capillaries.

(i) Name the gases involved.

…………………………………………………………………………………………(2 marks)

(ii) Explain how this process can happen.

…………………………………………………………………………………………

Alveolus

Bloodcapillaries

(1 mark)

RespirationPaper 1

1. B2. A3. B4. A5. D6. B

Paper 2

1. a) When the rubber sheet is pulled down, the pressure inside the bell jar decreases. Air from outside the bell jar decreases. Air from outside enter the ballons and the ballons inflates.

b)

c) The inhaled oxygen taken into the alveolus wall diffuse into the blood capillaries. The oxygen will combine with the haemoglobin to form oxyhaemoglobin. which

is carried to the heart from the lungs to the whole body. Later it decomposes to release oxygen and diffuses into cells.

d) Smoking can damage the lungs/ Smoking can cause cancer.