Biochemistry Of Nervous Tissue Flashcards
(13 cards)
What are the two types of nerves tissue cells ?
-Neurons: largest cells, transmit impulses
- Neuroglial cells: smaller, more abundant and
act as support for neurons.
What is neuroglia ?
Its a specialized connective tissue for the nervous system, Unlike neurones, neuroglia do not have a direct role in information processing but they are essential for the normal functioning of nerve cells.
How much of the total oxygen dose the human brain consume by an adult in the resting state ?
About 20%
In a well-fed state what dose the brain use for energy ?
It uses glucose for energy and depends on continual glucose supply, since it stores little glycogen.
In a well-fed state what dose the brain use for energy ?
It uses glucose for energy and depends on continual glucose supply, since it stores little glycogen.
In a fasting state where dose the brain get its energy from?
Keton bodies
What is hypoglycemia ?
Its a decrease in the blood glucose level, it influences the cognitive and memory process of the brain.
What happen when the glucose blood level goes below 50 mg/dl ?
It can cause symptoms of hypoglycemia including
dizziness and light- headedness.More marked drops lead to coma and death if uncorrected .
What is the normal fasting blood glucose level ?
between 70 mg/dL (3.9 mmol/L) and 100 mg/dL (5.6 mmol/L).
What happens despite the high sensitivity of neurons to hypoglycemic state ?
certain neurochemical changes allow the cells to become resistant to low concentrations of glucose.
What happens when neurons need energy under hypoglycemic conditions ?
The neurons must rely on lactate
What happens when the the neurons need energy under hypoglycemic conditions ?
It uses lactate
What happens in a few minutes in the absence of
