Chemicals which are released at the synaptic junction are called

1. hormones

2. neurotransmitters

3. cerebrospinal fluid

4. lymph

Potential difference across resting membrane is negatively charged. This is due to differential distribution of the following ions.

1. Na⁺ and K⁺ ions

2. CO₃^2- and Cl^- ions

3. Ca²⁺ and Mg²⁺ ions

4. Ca⁺⁴ and Cl^- ions

Resting membrane potential is maintained by

1. hormones

2. neurotransmitters

3. ion pumps

4. None of these

Which of the following is not involved in knee-jerk reflex?

1. Muscle spindle

2. Motor neuron

3. Brain

4. Inter neurons

An area in the brain which is associated with strong emotions is

1. cerebral cortex

2. cerebellum

3. limbic system

4. medulla