February 8, 2015

SSC Biology Imp Questions from New Syllabus - Control and Coordination

IV. Information Skills and Projects
Q: Write the functions of various parts of the brain.

A: Cerebrum: i) Seat of mental abilities, controls thinking, memory, reasoning, preparation, emotions and speech.
ii) Interprets sensations and responds to cold, heat, pain and pressure.

Diencephalon: i) Relay centre for sensory impulses, such as pain, temperature and light.
ii) Reflex centre for muscular activities.
iii) Centre for certain emotions such as anger.
iv) Centre for water balance, blood pressure, body temperature, sleep and hunger.
v) The hypothalamus controls the pituitary gland, which functions as the master gland.

Midbrain: It relays motor impulses from the cerebral cortex to the spinal cord and relays sensory impulses from the spinal cord to the thalamus, reflexes for sight and hearing.

Cerebellum: i) Maintains posture, equilibrium and muscle tone.
ii) Coordinates voluntary movements initiated by cerebrum.

Medulla oblongata: i) Contains centre for cardiac, respiratory and vasomotor activities. (Vasomotor refers to actions upon a blood vessel which alter its diameter).
ii) Coordinates reflexes like swallowing, coughing, sneezing and vomiting.

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