1. The life function responsible for the coordinationand control of all life activities in an organism isknown as(1) regulation (3) excretion(2) reproduction (4) nutrition

2. The sound from an automobile horn caused adog to run to the side of the road. This sound isan example of a(1) stimulus (3) reflex(2) response (4) synapse

3. What is one characteristic of a stimulus?(1) It may travel through a neuron.(2) It may be synthesized in a dendrite.(3) It may be stored in an effector.(4) It may initiate an impulse.

4. The movement of a bird away from a grass fire iscaused by(1) receptors initiating a stimulus(2) impulses forming in muscle tissue(3) muscles responding to a stimulus(4) effectors synthesizing neurotransmitters

5. A specialized neuron ending that detects changesin pressure in the skin is functioning as(1) an effector (3) a terminal branch(2) a synapse (4) a receptor

6. A receptor that detects stimuli from the externalenvironment is(1) a muscle fiber (3) a salivary gland(2) the thyroid gland (4) a taste bud

7. An electrochemical message that produces aresponse in a muscle is(1) a synapse (3) an impulse(2) an effector (4) a receptor

8. Nerve impulses are able to pass between neuronsonly at specialized junctions known as(1) dendrites (3) synapses(2) axons (4) cytons

9. The diagram below represents a neuron.

•1

11.

Which number indicates an area where a stimulusis detected and an electrochemical impulse isconducted to the cyton?(1) 1 (3) 3(2) 2 (4) 4

10. The diagram below represents the functional unitof a nervous system.

Which letter indicates a structure that secretes aneurotransmitter?(I) A (3)C(2)5 (4)£>

In humans, which substances are synthesized andsecreted by the terminal branches of nerve cells?(1) neurotransmitters (3) antibodies(2) auxins (4) vitamins

12. The diagram below represents part of the human nervous system.

The arrows in the diagram show the(1) movement of a stimulus in a cyton(2) transport of oxygen in a nerve(3) transfer of an impulse from one neuron to another(4) response of an effector to a stimulus

13. A neurotransmitter is best described as(1) a chemical that helps to relay impulses(2) an electrochemical impulse(3) a structure found in a dendrite(4) an external environmental stimulus

14. A blind student runs his fingers along a page ofbraille. Another student reads a page printed in atextbook. Both students are able to obtain andprocess the information most directly as a resultof the activities of the(1) sensory neurons and cerebrum(2) involuntary muscles and cerebellum(3) interneurons and spinal cord(4) smooth muscles and medulla

15. In a simple spinal reflex, the pathway for animpulse is along a sensory neuron directly to amotor neuron through(1) an effector (3) an interneuron(2) a receptor (4) the brain

16. The part of the human central nervous systemthat controls breathing is the(1) cerebrum (3) medulla(2) cerebellum (4) spinal cord

17. The nerves that directly control the muscles usedin writing are(1) part of the autonomic nervous system(2) regulated by the hypothalamus(3) part of the somatic nervous system(4) regulated by the medulla

18. The diagram below represents the human brain

The structure labeled Xis most directly involvedin the(1) control of breathing and heartbeat(2) maintenance of coordination and balance(3) interpretation of sensory impulses(4) initiation of voluntary actions

19. The portion of the nervous system that is mostclosely associated with the contraction of cardiacmuscle is the(1) autonomic nervous system(2) somatic nervous system(3) cerebrum(4) hypothalamus

20. When a child runs to his mother after hearing aclap of thunder, the child is using(1) the central nervous system, only(2) the peripheral nervous system, only(3) both the central and the peripheral nervous

systems(4) neither the central nor the peripheral nervous

system