Exam 8: Functional Organization of Nervous Systems
What receptors do the neurosecretory chromaffin cells of the adrenal medulla express?
C
In its protective role,the blood-brain barrier becomes an obstacle in delivering therapeutic drugs to specific regions of the brain in the treatment of a variety of brain disorders.Describe what the blood-brain barrier is made of,and how different compounds are capable of crossing it.
The blood brain barrier is formed by tight junctions between the endothelial cells lining the brain capillaries.It prevents materials from leaking out of the bloodstrea and into the central nervous system.These cells do not perform pinocytosis.Despite the tight junctions,there are still ways that compounds can cross the blood-brain barrier,including:
1.Dissolving in the membrane.Small lipid-soluble molecules such as ethanol and some barbiturate drugs can cross directly into the central nervous system.
2.Catalyzed transport mechanisms (protein exchanger,channel,pump)allow the brain to take up circulating nutrients such as glucose and amino acids.
3.In some areas of the brain,the blood-brain barrier is more permeable.In particular,the regions around the pineal gland,the pituitary gland,and parts of the hypothalamus are quite permeable,allowing secreted molecules such as hormones to leave the brain and enter the circulatory system.
In vertebrates,substances from the blood can access the central nervous system by
C
Succinctly explain how ocean acidification can affect the behavior of fish,such as the orange clownfish (Amphiprion percula).
The only organ controlled by efferent motor neurons is __________.
Which of the following structures is NOT included in the limbic system?
__________ is the evolutionary trend that describes the concentration of nervous tissue and sense organs at one end of the body.
The following structures of the mammalian nervous system,from posterior to anterior,are laid out in the following order:
In the sympathetic and parasympathetic nervous systems,the preganglionic neuron releases the neurotransmitter
The basic mechanism for short-term sensitization begins with
The autonomic nervous system can be differentiated into three branches.Which of the following is NOT one of them?
The mammalian cerebral hemispheres are connected by a mass of white matter called the __________.
Relative to other major groups of vertebrates,mammals and birds both have an enlarged
The __________ nervous system is sometimes referred to as the "fight or flight" nervous system.
In the vertebrate spinal cord,the dorsal horn is associated with __________ neurons,and the ventral horn is associated with __________ neurons.
In a newly discovered vertebrate,the area in the somatosensory cortex devoted to body part A is larger than the area devoted to body part B.This means that body part A
Filters
- Essay(0)
- Multiple Choice(0)
- Short Answer(0)
- True False(0)
- Matching(0)