Nervous tissue
What is the basic building blocks of nervous system ?
Neuron
what does the brain consist of?
brain is a mass of nerve tissue and is protected by membranes and the cranium/skull
what does the Central Nervous System consist of?
the brain and spinal cord.
what does the peripheral nervous system consist of?
cranial and spinal nerves
what is the definition of the autonomic nervous system?
helps to maintain a balance in involuntarily functions of the body. but allows the body to react in times of emergency.
What does the neuron consist of ?
( name any 3 )
Nucleus, nerve fibers/dendrites and axon
what is the largest section of the brain and the functions of it?
The cerebrum. its responsible for the reasoning, thoughts, memories, the 5 main bodily senses and voluntary body movement.
what surrounds and protects the spinal cord?
the spinal cord is surrounded and protected by vertebrae
what are the functions of spinal nerves?
carries messages to and from the spinal cord
sympathetic and parasympathetic nervous system.
the 2 main nerves in our body are sensory nerves and motor nerves.
the brain is fragile, therefore, what is it protected by?
it is protected by membranes and the cranium/skull.
how long is our spinal cord?
about 45cm long
what are the cranial nerves responsible for?
responsible for special senses such as sight and hearing. others, receive sensations such as touch, pressure, pain and temperature.
what happens to your heart rate after an emergency? (parasympathetic nervous system)
the heart rate decreases after an emergency
what happened if our neuron is damaged?
when neuron is damaged, it removes our ability to move as the body cannot receive signals
which part of the brain is triggered when a human sees or smell food?
the pons is triggered when a human sees or smells food.
what serves as a shock absorber?
Besides being a shock absorber, name 2 other functions.
Cerebrospinal fluid.
any 2 functions:
-helps to remove metabolic products and wastes
-after circulation, absorbed into the blood vessels of the dura mater.
-circulates continuously
-carries nutrients to parts of brain and spinal cord
what are the 31 spinal nerves:
-5
-12
-8
-1
-5
- 5 lumbar
- 12 thoracic
-8 cervical
-1 coccygeal
-5 sacral
what happens to your digestive system active during an emergency? (sympathetic nervous system)
the digestive system activity decreases after an emergency
where do axons arise from the neuron?
axons arise from the axon hillock, which is often called the "initial segment" of the axon (where action potentials are first generated)
the relation between our brain and multi-tasking?
multi-tasking is actually impossible. when we think we are multi-tasking, we're actually context-switching. that is, we're quickly switching back and forth between tasks rather than doing them at the same time.
what is the reason for the designation of the central nervous system?
this designation stems from the fact that both systems control and regulate biological functions and act at distance, receiving information from organs and tissues and sending effector commands (nervous impulses or hormones) to organs and tissues, thus integrating the body.
what are the 2 major divisions of the peripheral nervous system?
sensory and motor
why was it (ANS) termed the name sympathetic?
as the system sympathizes with your situation and attempts to help