Both sympathetic and parasympathetic divisions of ANS innervate SA node. Their actions on SA node can be called as:

1. antagonistic

2. complementary

3. synergistic

4. additive

Identify the tissue that receives only sympathetic innervations:

1. lung

2. most blood vessels

3. heart

4. small intestine

The "fight or flight" response is associated with:

1. parasympathetic division

2. sympathetic division

3. somatic motor nervous system

4. central nervous system

In the internal ear, perilymph is found in the:

1. utriculus

2. semicircular canals

3. scala media

4. scala vestibuli

Linear accelerations and head-tilts in the horizontal plane are detected by:

1. utricle

2. semicircular canals

3. organ of Corti

4. saccule

An age-related condition when the eye's lens doesn't change shape as easily as it once did [Presbyopia] is usually caused by:
1. decreasing the flexibility of the lens
2. an eyeball that is slightly too short
3. an eyeball that is slightly too long
4. a cornea with asymmetric curvature

Protein synthesis in neuron is carried out directly by:

The most common neurotransmitter in the body is:

1. serotonin

2. GABA

3. acetylcholine

4. adrenaline

An opioid peptide produced in the brain, especially in the pituitary gland, that blocks the sensation of pain is:

1. substance P

2. beta-endorphin

3. nicotine

4. neuropeptide

The type of neuron seen in the retina of human eye are:

1. bipolar

2. unipolar

3. multipolar

4. sensory