Parkinson's disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control and make use of neurotransmitter -

1. Norepinephrine

2. Acetylcholine

3. GABA

4. Dopamine

The number of correct statements amongst the given statements is:

I. Somatic neural system relays impulses from the CNS to smooth muscles of the body.

II. Myelinated nerve fibers are found in spinal nerves but nor in cranial nerves.

III. Sodium-potassium pump transports 3 sodium outwards and 2 potassium into the cell.

IV. Electrical synapses are rare in our system.

V. Efferent neurons carry signals from the CNS to the effector.

   1.  2         

   2.  3

   3.  4         

   4.  5

In the given diagram of the human skull, the bones represented by the letters A, B and C are respectively

          1. Sphenoid, Ethmoid and Lacrimal

          2. Ethmoid, Sphenoid and Lacrimal

          3. Sphenoid, Lacrimal and Ethmoid

          4. Ethmoid, Lacrimal and Sphenoid

The structure marked as X in the following diagram showing sagittal section of the human brain would be:

     1. Corpora quadrigemina

     2. Limbic system

     3. Corpus callosum

     4. Hippocampal gyrus

In the given diagram of cochlea, the tectorial membrane is represented by the letter:

            1.  A                   

            2.  B

            3.  C                 

            4.  D

The resting axonal membrane of a neuron:

1.  is not polarized

2.  has excess of anions on the outside

3.  is more permeable to potassium ions than to sodium ions

4.  cannot be excited by a stimulus

The specific receptor organ in the otolith organ of the internal ear are called as:

1.  Macula

2.  Crista

3.  Cupula

4.  Organ of Corti

A canal called as the cerebral aqueduct passes through the:

1. Diencephalon

2. Mid brain

3. III ventricle

4. IV ventricle

The parasympathetic division of the autonomic nervous system is characterized by each of these except which one?

1. Preganglionic fibers arise from the thoracic and lumbar regions of the spinal cord.

2. Terminal ganglia are located close to effector organs.

3. It controls the digestive activities.

4. Parasympathetic postganglionic fibers secrete acetylcholine.

One of the examples of the action of the autonomous nervous system is -

1. Knee-jerk reponse

2. Pupillary reflex

3. Peristalsis of the intestines

4. Swallowing of food