Weeks1-5 Flashcards
What does the medulla do?
Regulates breathing walking heart beat ect
What are the three interconnected layers of the brain?
Brain stem. Central core. Cerebrum.
What does the pons do?
Connects the spinal cord with the brain and links parts of the brain to one another.
What is the reticular formation?
Alerts the cerebral cortex to incoming sensory signals and is responsible for managing conscious and awakening from sleep.
Define the autonomic nervousness system (ans)
The subdivision of the peripheral nervous system controls the bodys involuntary motor functions.
What are the three major classes of neurons?
Motor, sensory, interneurons.
List three is the functions of glial cells
Hold neurons together. Remove dead or damaged neurons. Facilitate neural transmission.
An action potential is caused by what kind of input?
Excitatory inputs
At resting potential is the inside of the neurons lightly more negative or positive in comparison to the out side ?
Negative.
What are the two electrically charged atoms that are associated with action potentials?
Sodium and potassium.
What is the refractory period ?
Period of rest during which a new nerve impulse cannot be activated in a segment of an axon
The relaying of information across the synaptic vapid termed what?
Synaptic transmission
What are the two subdivisions of the peripheral nervous system
Somatic nervous system and the autonomic nervous system
What does the autonomic nervous system do
Controls the body’s involuntary motor responses
Which division of the autonomic nervous system monitors routine operation of the body’s internal functions.
Parasympathetic division.
What connects the 2 cerebral hemispheres?
Corpus collosum
What divided each hemisphere I to four areas?
Lateral fissure, central suicus corpus collosum. CHeAK
What are the parts of the brain stem?
Medulla. Pons. Reticular formation Thalamus. Cerebellum.
What makes up the limbic system?
The hypothalamus Hippocampus. Amygdala.
What are photoreceptors?
Receptor cell in the retina that are sensitive to light.
What are rods?
Photoreceptors concentrated in the periphery of the retina that are most active in din illumination.
What are cones
Photoreceptors concentrated in the centre if the retina responsible for visual experiences of colour.
Explain accommodation.
The process by which the ciliary muscles change the thickness of the lens of the eye to permit variable focusing on near and distant objects.
Dark adaptation.
The gradual improvement of the eyes sensitivity after a shift in illumination from light to near darkness
