Worksheet 7.1 The Respiratory Structures And Breathing Mechanisms In Humans And Animals 2b5ql

Name : _____________________________

Chapter 7 Respiration

__________________________________________________________________________________________

CHAPTER 7 : RESPIRATION WORKSHEET 7.1 The Respiratory Structures and Breathing Mechanisms in Humans and Animals

Score __ /__ ____

1. Label the figure below a. Gaseous exchange occurs over the whole plasma membrane of an Amoeba sp

P: Q:

the pathway of _________ diffusion the pathway of __________________ being eliminated i.

The respiratory surface for Amoeba sp. is the entire _____________________ membrane.

ii. It has a _________________ surface area per unit volume of the body, therefore ____________ alone is sufficient to transport gases into and out of the body [ 7 marks ] b. The tracheal system of an insect

i.

The respiratory system of insects is known as the ______________ system, which is composed of air tubes called ________________.

ii. Air enters the tracheae through ________________ which have _____________. iii. The trachea is reinforced with rings of ___________________ to prevent it from _____________________. iv. The trachea branches into _____________ which provide a large surface area for the ________ of gases.

[ 12 marks ]

_________________________________________________________________________________________ WAJA BIOLOGY 2009 7.1/1 JPN PERAK

Name : _____________________________

Chapter 7 Respiration

__________________________________________________________________________________________

c. The respiratory structure of a frog Q: P:

i.. Gaseous

exchange

in

frogs

occurs

through

the

____________

and

_____________. ii. The skin is _________________ and highly ___________ to respiratory gases with a lot of ______________ under it. iii. The lungs consist of two air ___________ with thin, ___________ which are covered by a network of capillaries ______________.

[ 10 marks ]

d. The respiratory structure and breathing mechanism of a fish

i.

Fish have ______ pairs of gills.

ii

Each gill is composed of ________ which have numerous thin –walled ________ that have a rich supply of ____________________.

[ 4 marks ]

_________________________________________________________________________________________ WAJA BIOLOGY 2009 7.1/2 JPN PERAK

Name : _____________________________

Chapter 7 Respiration

__________________________________________________________________________________________

2.

a. Label the figure below :

P Q S R [ 4 marks ] b. Rearrange the sequence in the correct order using numbers Inspiration / inhalation Ribs move upwards and outwards External intercostal muscles contract Diaphragm contracts Thoracic volume increases Air moves into the lungs Diaphragm flattens downwards Internal intercostal muscles relax Air pressure inside lungs decreases

Number

[ 8 marks ] c.

The graph in Figure below shows the changes in lung air pressure during inhalation and exhalation. Air pressure in the lungs (mm Hg) 765 P

Q

760 S

755

[ 1 marks ]

Time/sec R Circle the part which represents the time when the rib bone starts moving upwards. ANSWERS WORKSHEET 7.1 The Respiratory Structures and Breathing Mechanisms in Humans and Animals

7.1/3

_________________________________________________________________________________________ WAJA BIOLOGY 2009 JPN PERAK

Name : _____________________________

Chapter 7 Respiration

__________________________________________________________________________________________

1. Label the figure below a. Gaseous exchange occurs over the whole plasma membrane of an Amoeba sp

P: cytoplasm Q: nucleus

the pathway of oxygen diffusion the pathway of carbon dioxide being eliminated i. ii.

The respiratory surface for Amoeba sp. is the entire plasma membrane. It has a large surface area per unit volume of the body, therefore diffusion alone is sufficient to transport gases into and out of the body

b. The tracheal system of an insect tracheole

spiracle

cell

trachea i. ii. iii. iv.

The respiratory system of insects is known as the tracheal system, which is composed of air tubes called tracheae. Air enters the tracheae through spiracles which have valves. The trachea is reinforced with rings of chitin to prevent it from collapsing. The tracheae branches into tracheoles which provide a large surface area for the diffusion of gases.

c. The respiratory structure of a frog

7.1/4

_________________________________________________________________________________________ WAJA BIOLOGY 2009 JPN PERAK

Name : _____________________________

Chapter 7 Respiration

__________________________________________________________________________________________

Q: nostril P: lung

Gaseous exchange in frogs occurs through the skin and lungs. The skin is thin and highly permeable to respiratory gases with a lot of blood capillaries under it. The lungs consist of two air sacs with thin, moist membrane which are covered by a network of capillaries.

i. ii. iii. d.

Fish have four pairs of gills. Each gill is composed of filaments which have numerous thin –walled lamellae that have a rich supply of blood capillaries.

i. ii. 2.

The respiratory structure and breathing mechanism of fish

a.

Label the figure below

P

trachea

Q

rib

S

alveolus

R

diaphragm

b. Rearrange the sequence in the correct order using numbers 7.1/5

_________________________________________________________________________________________ WAJA BIOLOGY 2009 JPN PERAK

Name : _____________________________

Chapter 7 Respiration

__________________________________________________________________________________________

Inspiration / inhalation Ribs move upwards and outwards External intercostal muscles contract Diaphragm contracts Thoracic volume increases Air moves into the lungs Diaphragm flattens downwards Internal intercostal muscles relax Air pressure inside lungs decreases

c.

Number 3 1 4 6 8 5 2 7

The graph in Figure below shows the changes in lung air pressure during inhalation and exhalation. Air pressure in the lungs (mm Hg)

765 P

Q

760 S

755 Time/sec R Circle the part which represents the time when the rib bone starts moving upwards?

7.1/6

_________________________________________________________________________________________ WAJA BIOLOGY 2009 JPN PERAK