How is transmission of nerve impulses across a synaptic cleft carried out in humans?
Sodium ions
Potassium ions
Neurotransmitter molecules
The nodes of Ranvier
Which of the following hormones require iodine?
Thyroxin
Aldosterone
Parathyroid hormone
Insulin
Which of the following are types of neurons?
Sensory
Motor
Interneurons
All of the above
The peripheral nervous system includes mixed nerves that:
serve the muscular and skeletal system.
serve the sympathetic system.
serve the parasympathetic system.
contain both sensory and motor fibers.
Which of the following contains centers for heartbeat, breathing, and blood pressure?
Cerebellum
Cerebrum
Spinal cord
Medulla oblongata
Humans have how many pairs of cranial nerves ?
4
12
16
21
How is transmission across a synapse achieved ?
Ionic bonding
Diffusion of neurotransmitter across the cleft
Physical contact of axon to dendrite allowing the nerve impulse to continue onward
Diffusion of sodium ions across the cleft
How does an axon conducts nerve impulses ?
Away from the cell body
Towards the cell body
Both towards and away from the cell body
Around, bypassing the cell body
The blood glucose levels are decreased by:
insulin
thyroxin
aldosterone
cortisol
The peripheral nervous system includes the nerves, which are neurons with cell bodies that occur in the:
sympathetic nervous system
brain, spinal cord, or in ganglia
motor system
autonomic system
