1. The somatic nervous system stimulates ____________ muscle. The autonomic nervous system stimulates ___________ muscle, ____________ muscle, and ___________. 2. The autonomic nervous system (ANS) consists of two divisions, each innervating the effector organs. The sympathetic nervous system (SNS) generally speeds up everything except digestion. The parasympathetic nervous system (PNS) generally slows down everything but digestion.
Signals from the SNS cause the heart rate to _________, while signals from the PNS cause the heart rate to ___________. Signals from the SNS cause smooth muscles of the intestine to _________ contractions, while signals from the PNS cause these muscles to _________ contractions. Signals from the SNS also cause the adrenal gland to _________ epinephrine and norepinephrine. 3. Neurons can excite or inhibit another neuron. Exciting another neuron will increase the chances of a/an ___________________ in the second neuron. Inhibiting another neuron will make the chances of a/an __________________ less likely. 4. Axons from one neuron can synapse with the dendrites or soma of another axon. These synapses are called ______________________ (on dendrites) and _________________________ (on soma). They carry input signals to the other neuron. Axons from one neuron can synapse with the axon terminal of another neuron. These synapses are called ________________________, and they regulate the amount of ________________________ released by the other neuron. 5. The electrical synapse: Electrical current flows from one neuron to another through _________________. These synapses are always (excitatory or inhibitory). Advantages of the electrical synapses: 1. _______ signal conduction 2. _____________ activity for a group of neurons. 6. The chemical synapse: Chemical