1. 1. Nervous System Neurons

2. Neuro ns 2. Carry electrical and chemical signals called impulses.

3. Neuro ns 3. Sensory

4. Neuro ns 4. carry impulses from the sense organs to the brain.

5. Neuro ns 5. Motor

6. Neuro ns 6. carry impulses from the brain to muscles and glands.

7. Neuro ns 7. Interneurons

8. Neuro ns 8. connect sensory and motor neurons and carry impulses between them.

9. Neuro ns 9. Structures of a Neuron Dendrites

10. Neuro ns 10. Structures of a Neuron Cell body

11. Neuro ns 11. Structures of a Neuron Axon

12. Neuro ns 12. Structures of a Neuron Axon terminals

13. Neuro ns 13. Structures of a Neuron Nucleus

14. 14 Axon terminal Direction of the impulse.

15. 15 Dendrite Direction of the impulse.

16. 16 Neurotransmitter (a chemical) Direction of the impulse.

17. 17 Synapse (the space between neurons) Direction of the impulse.

18. 35–1 The process by which an organism keeps internal conditions relatively constant is called a.a feedback loop. b.homeostasis. c.negative feedback. d.normal temperature.

19. 35–1 Which of the following is NOT an example of feedback inhibition? a.shivering to warm the body b.sweating to cool the body c.turning on the heating system of a house d.nervous tissue receiving messages

20. 35-2 The part of the neuron that carries impulses toward the cell body is the a.dendrite. b.myelin sheath. c.axon. d.nodes.

21. 35-2 Neurons that carry impulses from the brain and spinal cord to the muscles are a.interneurons. b.sensory neurons. c.resting neurons. d.motor neurons.

22. 35-2 Chemicals that are used by a neuron to transmit impulses are called a.neurotransmitters. b.synapses. c.axons. d.inhibitors.

23. 35-2 The minimum level of a stimulus that is required to activate a neuron is called its a.action potential. b.resting potential. c.threshold. d.synapse.