BIOD 152 Module 2 The Brain-Questions and
Answers |Latest 2026 Revised Update|100%
Correct.
What are the two main divisions of the central nervous system?
the Brain and spinal cord
What are the divisions of the human brain?
the cerebrum, brainstem, diencephalon, and the cerebellum
Why are the protective structures of the brain important?
because neurons are not replaceable and nervous tissue is damaged even by the slightest pressure
what protects the brain?
the skull, meninges, a cushion of cerebrospinal fluid and the blood brain barrier
what are ventricles and how many are there?
cavities within the brain that are filled with cerebrospinal fluid (CSF)
4 ventricles
where does the fourth ventricle drain into ?
the central canal of the spinal cord
what are meninges? what are the three layers
three layers of connective tissue membranes that cover and protect central nervous system organs
and enclose cerebrospinal fluid.
, -dura mater: leathery double layered outer meninx
-arachnoid layer: loose layer separated from dura mater by the subdural space
-subarachnoid space: beneath the arachnoid meninx and contains blood vessels and is filled with
CSF
-pia mater: inner meninx; thin connective tissue tightly attached to the brain
what is cerebrospinal fluid (CSF)? what is the choroid plexus?
special fluid formed in the walls of the ventricles from blood plasma by permeating through the
choroid plexus
the choroid plexus is formed from a network of blood vessels within the ventricles
CSF circulates through the ventricles and into the meninges
it cushions the brain and spinal cord and provides buoyancy (allows brain to float)
what is the blood brain barrier? how is it formed
a diffusion barrier that prevents most particles from entering the central nervous system tissue
keeps the brain and spinal cord separate from general blood circulation
formed by relatively impermeable blood capillaries due to the glial cells astrocytes
why is it important to have a stable internal environment?
Answers |Latest 2026 Revised Update|100%
Correct.
What are the two main divisions of the central nervous system?
the Brain and spinal cord
What are the divisions of the human brain?
the cerebrum, brainstem, diencephalon, and the cerebellum
Why are the protective structures of the brain important?
because neurons are not replaceable and nervous tissue is damaged even by the slightest pressure
what protects the brain?
the skull, meninges, a cushion of cerebrospinal fluid and the blood brain barrier
what are ventricles and how many are there?
cavities within the brain that are filled with cerebrospinal fluid (CSF)
4 ventricles
where does the fourth ventricle drain into ?
the central canal of the spinal cord
what are meninges? what are the three layers
three layers of connective tissue membranes that cover and protect central nervous system organs
and enclose cerebrospinal fluid.
, -dura mater: leathery double layered outer meninx
-arachnoid layer: loose layer separated from dura mater by the subdural space
-subarachnoid space: beneath the arachnoid meninx and contains blood vessels and is filled with
CSF
-pia mater: inner meninx; thin connective tissue tightly attached to the brain
what is cerebrospinal fluid (CSF)? what is the choroid plexus?
special fluid formed in the walls of the ventricles from blood plasma by permeating through the
choroid plexus
the choroid plexus is formed from a network of blood vessels within the ventricles
CSF circulates through the ventricles and into the meninges
it cushions the brain and spinal cord and provides buoyancy (allows brain to float)
what is the blood brain barrier? how is it formed
a diffusion barrier that prevents most particles from entering the central nervous system tissue
keeps the brain and spinal cord separate from general blood circulation
formed by relatively impermeable blood capillaries due to the glial cells astrocytes
why is it important to have a stable internal environment?
