PSY 113 Lecture Notes - Lecture 3: Symmetry In Biology, Stretch Reflex, Smooth Muscle Tissue
Document Summary
Ans innervates visceral muscles and glands (biofeedback!) Fight or flight situation- sympathetic is dominant. The stretch reflex- only two types of neurons, if severe spinal cord, no inhibitory control by the brain. Afferent- sensory neuron vs efferent- motor neuron. The human nervous system is composed of glial cells and neurons. Presynaptic terminal- end of the neuron before the synnapps. Intra-neuronal transmission (electrical) begins at dendrites and ends at axon terminal. The rmp is -70 mv, meaning that the cell is more negative inside than outside and that means that it is polarized, or ready and waiting to produce a neural signal. A neural signal is a -------- phenomenon, as it travels along the length of a single neuron. Takes place at the axon where there are special na channels. Allows neural signals to travel long distances in the body. And, all action potentials take this form. By means of its temporal characteristics or ,its rate of firing!!
