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All questions of Respiration and moving for Class 8 Exam
Air can enter and leave the lungs because .......- a)of pressure changes
- b)the volume of the thorax (chest) remains the same
- c)there is gas exchange
- d)there is no pressure change
Correct answer is option 'A'. Can you explain this answer?
Air can enter and leave the lungs because .......
a)
of pressure changes
b)
the volume of the thorax (chest) remains the same
c)
there is gas exchange
d)
there is no pressure change
 | Knowledge Centre answered |
The animal uses its chest muscles to increase the volume of its lungs. The air inside the lungs is therefore more spread out than before, so it has a lower pressure. The higher pressure of the air outside of the lungs forces air into the lungs. The opposite is true of breathing out.
Which muscle type is responsible for involuntary movements in the body?- a)Skeletal muscle
- b)Cardiac muscle
- c)Smooth muscle
- d)Striated muscle
Correct answer is option 'C'. Can you explain this answer?
Which muscle type is responsible for involuntary movements in the body?
a)
Skeletal muscle
b)
Cardiac muscle
c)
Smooth muscle
d)
Striated muscle
 | Rahul Kumar answered |
Smooth muscle is found in the walls of internal organs and blood vessels. It is responsible for involuntary movements such as peristalsis (in the digestive system) and controlling the diameter of blood vessels. Skeletal muscle is responsible for voluntary movements, cardiac muscle is found only in the heart and is involuntary but has its own characteristics, and striated muscle is a term that can refer to both cardiac and skeletal muscle, but not to smooth
Oxygen passes from the alveoli into the blood. How is it transported?- a)By blood plasma
- b)By dissolving in water
- c)By red blood cells
- d)By white blood cells
Correct answer is option 'C'. Can you explain this answer?
Oxygen passes from the alveoli into the blood. How is it transported?
a)
By blood plasma
b)
By dissolving in water
c)
By red blood cells
d)
By white blood cells
 | Nidhi Bhatt answered |
Haemoglobin in red blood cells joins with oxygen.
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