Advertisements
Advertisements
प्रश्न
Read the following passage and answer the questions that follow:
| A middle-aged person is facing some cognitive changes in himself. His early symptoms included mild forgetfulness. For example, forgetting where he left his mobile or failing to find words to complete his sentences. He was facing problems in driving a car, climbing up and down the stairs, inserting a plug into an outlet. He slowly developed a sad mood and anxiety. |
(a) What are voluntary actions? [1]
(b) Which part of the brain is responsible for precision of voluntary actions? [1]
(c) (i) Explain the role of the medulla. [2]
OR
(c) (ii) How do the animal muscles move? [2]
Advertisements
उत्तर
(a) Voluntary actions are actions that are performed under the conscious control of the brain, such as walking, writing, or speaking.
(b) The cerebellum is responsible for the precision of voluntary actions.
(c) (i) The medulla (medulla oblongata) controls involuntary actions of the body such as breathing, heartbeat, blood pressure, swallowing, and vomiting. It ensures the proper functioning of vital life processes.
OR
(c) (ii) Muscles move by the contraction and relaxation of muscle fibres.
They work in pairs (antagonistic muscles). When one muscle contracts, the other relaxes, causing movement of body parts.
