Human Nervous System (1.2) [HY] Flashcards
1
Q
Interneurons
A
- found between other neurons and are the most numerous
of the three types of neurons. - predominantly in the
brain and spinal cord - linked to reflexive behavior
2
Q
Reflex arcs
A
- control interneuron reflexive behavior
3
Q
How many spinal nerves are there?
A
31 pairs
4
Q
What system are spinal nerves a part of?
A
PNS
5
Q
How many cranial nerves are there?
A
12 pairs (come directly from the brain)
6
Q
Somatic Nervous System
A
- consists of sensory and motor neurons
- distributed throughout the skin, joints, and
muscles
7
Q
Autonomic Nervous System
A
- generally regulates heartbeat, respiration, digestion, and glandular secretions
- manages the involuntary muscles associated with many internal organs and
glands.
8
Q
What is the neurotransmitter for the the parasympathetic nervous system?
A
Acetylcholine
9
Q
Signs of sympathetic nervous system activation?
A
- Increases heart rate
- Redistributes blood to muscles of locomotion
- Increases blood glucose concentration
- Relaxes the bronchi
- Decreases digestion and peristalsis
- Dilates the eyes to maximize light intake
- Releases epinephrine into the bloodstream
