Alzheimer disease in humans is associated with the deficiency of

1. dopamine

2. glutamic acid

3. acetylcholine

4. Gamma Amino Butyric Acid (GABA)

The kind of tissue that forms the supportive structure in our pinna (external ears) is also

found in

1. vertebrae

2. nails

3. ear ossicles

4. tip of the nose

Given below is a diagrammatic cross section of a single loop of human cochlea.

Which one of the following options correctly. represents the names of three different

parts?

1. B : Tectorial membrane
    C: Perilymph
    D : Secretory cells

2. C: Endolymph
    D : Sensory hair celis
    A: Serum

3. D: Sensory hair cells
    A: Endolymph
    B: Tectorial membrane

4. A : Perilymph
    B: Tectorial membrane
    C: Endolymph

Which one of the following is the correct difference between rod cells and cone cells of our retina? 

During the propagation of a nerve impulse, the action potential results from the movement of

1. K⁺ ions from extracelular fluid to intracellular fluid

2. Na⁺ ions from intracellular fluid to extracellular fluid

3. K⁺ ions from intracellular fluid to extracellular fluid

4. Na⁺ ions from extracellular fluid to intracellular fluid

Cornea transplant in humans is almost never rejected. This is because

1. its cells are least penetrable by bacteria

2. it has no blood supply

3. it is composed of enucleated cells

4. it is a non-living layer

Which one of the following is an example of negative feedback loop in humans

1. Constriction of skin blood vessels and contraction of skeletal muscles when it is too

cold

2. Secretion of tears after falling of sand particles into the eye

3. Salivation of mouth at the sight of delicious food

4. Secretion of sweat glands and constriction of skin blood vessels when it is too hot

Bowman's glands are located in the:

1. proximal end of uriniferous tubules

2. anterior pitutary

3. female reproductive system of cockroach

4. olfactory epithelium of our nose

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell ?

(1) Perikaryon and dendrites

(2) Vacuoles and fibres

(3) Flagellum and medullary sheath

(4) Nucleus and mitochondria

Which one of the following statements is correct?
1. Neurons regulate endocrine activity, but not vice versa
2. Endocrine glands regulate neural activity and nervous system regulates endocrine glands
3. Neither hormones control neural activity nor the neurons control endocrine activity
4. Endocrine glands regulate neural activity, but not vice versa