Which structure in the ear converts pressure waves to action potentials?

(a)

Tympanic membrane

(b)

Organ of Corti

(c)

Oval window

(d)

Semicircular canal

Assertion(A): The imbalance in concentration of Na⁺, K⁺ and proteins generates action potential.
Reason(R): To maintain the unequal distribution of Na⁺ and K⁺, the neurons use electrical energy.

(a)

Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.

(b)

Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.

(c)

Assertion is true, but Reason is false.

(d)

Both Assertion and Reason are false

The respiratory centre is present in the _______.

(a)

Medulla oblongata

(b)

Hypothalamus

(c)

Cerebellum

(d)

Thalamus

Which of the following statements is wrong regarding conduction of nerve impulse?

(a)

In a resting neuron, the axonal membrane is more permeable to K⁺ ions and nearly impermeable to Na⁺ ions.

(b)

Fluid outside the axonal has a high concentration of Na⁺ ions and low concentration of K⁺, in a resting neuron.

(c)

Ionic gradients are maintained by Na⁺ K⁺ pumps across the resting membrane, which transport 3Na ions outwards for 2K⁺ into the cell

(d)

A neuron is polarized only when the outer surface of the axonal membrane possess a negative a charge and its inner surface is positively charged

When the potential across the axon membrane Is more negative than the normal resting potential, the neuron is said to be in a state of ______.

(a)

Depolarization

(b)

Hyperpolarization

(c)

Repolarization

(d)

Hypopolarization

The sleep and wake cycle is controlled by __________ gland.

(a)

Pituitary

(b)

Pineal

(c)

Thymus

(d)

Adrenal

Foramen of Munro corresponds to _____________ Ventricle.

(a)

First

(b)

Third

(c)

Second

(d)

Fourth

Pick out the gland which is found in the ear ______________

(a)

Ceruminous glands

(b)

Lachrymal gland

(c)

Ciliary gland

(d)

Salivary gland

Facial nerve is a _________ nerve. 

(a)

Sensory

(b)

Mixed

(c)

Motor

(d)

Efferent

The ________ lobe of the cerebrum controls visual processing.

(a)

Parietal

(b)

Frontal

(c)

Occipital

(d)

Temporal