BIOD 152 MODULE 2 FULLY SOLVED EXAM
PAPER GRADED A+
◉ why are the protective structures of the brain important ?
Answer: neurons are not replaceable and nervous tissue is damaged
by even the slightest pressure
◉ what protects the brain?
Answer: the skull, the meninges, a cushion of cerebrospinal fluid and
the blood brain barrier
◉ how many ventricles are inside the brain ?
Answer: four ventricles
◉ describe the function of the brain ventricles
Answer: cavities within the brain that are filled with cerebrospinal
fluid (CSF)
there are four ventricles in the interior of the brain, they are
chambers filled with CSF which is produced there. Once formed the
CSF circulates through the ventricles and into the subarachnoid
space of the brain.
,◉ where does the fourth ventricle drain into?
Answer: the central canal of the spinal cord which also contains CSF
◉ what are the meninges?
Answer: three layers of connective tissue membranes that cover and
protect CNS organs and enclose CSF
◉ what are the layers of the meninges?
Answer: the outer layer: dura mater
the middle: arachnoid meninx (separated from dura mater by
subdural space) (beneath this is the subarachnoid space which
contains blood vessels and is filled with CSF)
the inner: Pia mater (thin connective tissue tightly attached to the
brain)
◉ this is the most superficial layer of the brain meninges?
Answer: dura mater (menix)
◉ what is cerebrospinal fluid CSF?
Answer: a special fluid formed in the walls of the ventricles from
blood plasma by permeating through the choroid plexus
, ◉ what is the choroid plexus formed by
Answer: formed from a network of blood vessels within the
ventricles
CSF circulates through the ventricles and into the meninges.
◉ what is the blood brain barrier
Answer: a diffusion barrier that prevents most particles from
entering the CNS tissue keeping the brain and spinal cord separate
from general blood circulation
◉ what forms the blood brain barrier and what protects it
Answer: formed by the relatively impermeable brain capillaries.
glial cells astrocytes wrap tightly around capillaries to prevent
harmful substances from harming neurons
◉ What is the largest portion of the brain?
Answer: cerebrum
comprising about 83% of total brain mass
◉ what separates the left and right cerebral hemispheres
Answer: the median longitudinal fissure
PAPER GRADED A+
◉ why are the protective structures of the brain important ?
Answer: neurons are not replaceable and nervous tissue is damaged
by even the slightest pressure
◉ what protects the brain?
Answer: the skull, the meninges, a cushion of cerebrospinal fluid and
the blood brain barrier
◉ how many ventricles are inside the brain ?
Answer: four ventricles
◉ describe the function of the brain ventricles
Answer: cavities within the brain that are filled with cerebrospinal
fluid (CSF)
there are four ventricles in the interior of the brain, they are
chambers filled with CSF which is produced there. Once formed the
CSF circulates through the ventricles and into the subarachnoid
space of the brain.
,◉ where does the fourth ventricle drain into?
Answer: the central canal of the spinal cord which also contains CSF
◉ what are the meninges?
Answer: three layers of connective tissue membranes that cover and
protect CNS organs and enclose CSF
◉ what are the layers of the meninges?
Answer: the outer layer: dura mater
the middle: arachnoid meninx (separated from dura mater by
subdural space) (beneath this is the subarachnoid space which
contains blood vessels and is filled with CSF)
the inner: Pia mater (thin connective tissue tightly attached to the
brain)
◉ this is the most superficial layer of the brain meninges?
Answer: dura mater (menix)
◉ what is cerebrospinal fluid CSF?
Answer: a special fluid formed in the walls of the ventricles from
blood plasma by permeating through the choroid plexus
, ◉ what is the choroid plexus formed by
Answer: formed from a network of blood vessels within the
ventricles
CSF circulates through the ventricles and into the meninges.
◉ what is the blood brain barrier
Answer: a diffusion barrier that prevents most particles from
entering the CNS tissue keeping the brain and spinal cord separate
from general blood circulation
◉ what forms the blood brain barrier and what protects it
Answer: formed by the relatively impermeable brain capillaries.
glial cells astrocytes wrap tightly around capillaries to prevent
harmful substances from harming neurons
◉ What is the largest portion of the brain?
Answer: cerebrum
comprising about 83% of total brain mass
◉ what separates the left and right cerebral hemispheres
Answer: the median longitudinal fissure
