Terms in this set (9)
Explain how action potentials are generated and propagated along neurons.
Thus, the sodium channel activation moves in a wave-like fashion: the action potential is propagated down the length of the neuron, from its input source at the dendrites, to the cell body, and then down the axon to the synaptic terminals.
Describe a reflex arc.
A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord.
Describe the organization of the nervous systems and a general function for each division
The human central nervous system contains the brain, spinal cord, and retina. The peripheral nervous system consists of sensory neurons, clusters of neurons called ganglia, and nerves connecting them to each other and to the central nervous system.
The brain is the center of our thoughts, the interpreter of our external environment, and the origin of control over body movement.
The primary role of the PNS is to connect the CNS to the organs, limbs, and skin
Label the action potential graph below. Identify where depolarization, repolarization and hyperpolarization are occurring. When is the neuron in absolute and relative refractory periods?
Fill in the table below for neurotransmitters:
Describe how signals are transmitted via G-protein coupled receptors and the types of cellular responses they can cause.
Receptors come in many types, but they can be divided into two categories: intracellular receptors, which are found inside of the cell (in the cytoplasm or nucleus), and cell surface receptors, which are found in the plasma membrane.
When a hormone enters a cell and binds to its receptor, it causes the receptor to change shape, allowing the receptor-hormone complex to enter the nucleus (if it wasn't there already) and regulate gene activity. Hormone binding exposes regions of the receptor that have DNA-binding activity, meaning they can attach to specific sequences of DNA.
Identify 6 functions of the hypothalamus and describe.
body temp regulation
blood pressure and heart rate
Fill in the table below for the cranial nerves.
some say marry money but my brother believes big boobs matter most
optic- from retina (visual)
oculomotor- motor movement of eye
trigeminal- cranial nerves
abducens- moves eyes side to side
facial nerves- facial expression and taste buds
vestibulochlear- balance and hearing
glossopharyngeal- tongue and pharynx (salivary glands)
vagus- extend beyond head and neck (heart and lungs)
accessory- shrug shoulders
hypoglossal- swallowing and speech
Describe Babinski's sign and what it indicates in babies and adults.
In adults or children over 2 years old, a positive Babinski sign happens when the big toe bends up and back to the top of the foot and the other toes fan out. This can mean that you may have an underlying nervous system or brain condition that's causing your reflexes to react abnormally.
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