1. the senses of taste and smell involve sensory receptors called

a. photoreceptors
b. chemoreceptors
c. thermoreceptors
d. mechanoreceptors

2. reflexes are behaviors that

a. involve only sensory control
b. are controlled by the automatic nervous system
c. are under conscious control
d. occur involuntarily without conscious control.

3. involuntary activities carried out throughout the body are the primary responsibility of the

a. somatic nervous system
b. autonomic nervous system
c. spinal cord
d. limbic system

4. the outer layer if the skin is called

a. dermis
b. keratin
c. epidermis
d. melanin