Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Neural Control and Coordination

Multiple Choice Questions

331.

If a stimulus, several times greater than the threshold stimulus is provided to a muscle fibre, it will

contract with a larger force
contract with a smaller force
contract with the same force
undergo tetany.

332.

Sella Turcica is found

in bones
in joints
nearby pituitary
nearby thyroid

333.
Which of the following statement is wrong regarding conduction of nerve impulse?

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

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

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

Resting potential is the electrical potential difference across the resting membrane

Resting potential is the electrical potential difference across the resting membrane

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

In a resting nerve fibre, axoplasm contains a high concentration of K⁺ and negatively charged proteins and low concentration of Na⁺. In contrast, the fluid outside axon contains a low concentration of K⁺ and a high concentration of Na⁺ and thus forms a concentration gradient. This ionic gradient is maintained by Na⁺ – K⁺ pump. As a result, the outer surface of axonal membrane possesses a positive charge while its inner surface is negatively charged and therefore is polarised.