15. The vital centers for the control of heart rate, respiration, and blood pres

Question

15. The vital centers for the control of heart rate, respiration, and blood pressure are located in the A) pons B) medulla C) midbrain D) cerebrunm t6. Which fissure sparates the cerebral hemispheres? A) central fissure B) longitudinal fissure C) parieto-occipital fissure D) lateral fissure 17. Which of the following generalizations does not describe the cerebral cortex? A) The cerebral cortex contains three kinds of functional areas. B) Each hemisphere is chiefly concerned with sensory and motor functions of the contralateral side of the body C) The hemispheres are exactly equal in function. D) No functional area of the cortex works alone. 18. The hypothalamus A) is the thermostat of the body because it regulates temperature B) is an important auditory and visual relay center C) has the Pulvinar body as part of its structure D) mediates sensations

Explanation / Answer

Q.15)
Brain stem is the stalk of the brain which connects the forebrain(cerebrum,thalamus and hypothalamus) to the spinal cord.
The brain stem consists of mid brain,pons and medulla oblongata(or simply the medulla).

The cerebrum is responsible for speech,motor development,personality,thinking,memory.

The midbrain is involved in the visual and auditory reflex pathways,unconcscious regulation and control of motor activities.

The pons has a respiratory center which helps control the respiratory movements along with medulla.

The medulla oblongata has various vital autonomic reflex centres responsible for controlling
1. heart rate,
2.blood vessel diameter this controlling blood pressure,
3.breathing(due to the presence of respiratory center)
4.swallowing
5.coughing
6.vomiting
7.sneezing

Hence,the answer is B.)Medulla

Q.)18.
The functions of hypothalamus are:
1.Regulation of body temperature
eg:response to cold by stimulating the
shivering center.
Hence hypothalamus is called the thermostat(i.e., regulator)of the body.
2.Secretion of certain hormones that act on pituitary gland and other parts of body
Hence called the master endocrine gland
3.Sexual behaviour
4.It has satiety,feeding and thirst centres
5.Plays a role in the regulation of circadian rhythms
6.It has sleep center

'B' is not the answer because the auditory and visual relay centres are present in the mid brain.

'C' is not the answer because the Pulvinar body is present in the thalamus

'D' is not the answer because sensations are mediated by the diencephalon

Hence,the answer is 'A'

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