9.I’m Joe’s Brain (12 HM Q.Ans)
9.I’m Joe’s Brain
Q.1. what does the brain consist of? 2015 ,2016
Ans. The brain consists of neurons and glial cells. It is one and a half kilo mushroom of grey and white tissue of gelatinous consistency.
Q.2. How does the brain react in emergency situations? Sup 14
Ans. In emergency situation, the brain instantly shifts gears. It directs and warns according to the situations. it performs thousands of housekeeping jobs as supervising, breathing etc.
Q.3.what does the brain do when carbon dioxide level rises in the blood?
Ans. When carbon dioxide level rises in the blood the brain steps up the breathing rate.
Q.4. what will happen when the brain does not get the oxygen and blood it requires ?
Ans. If the brain does not get the oxygen and blood it needs, it will suffer a grave damage and the result could be paralysis or even death.
Q.5. what is a blood –brain barrier? how does it work ? 2017
Ans. A blood –brain barrier serves as a gate-keeper it allows some things to go in but stops others to do so.
Q.6. Describe the structure of the brain . 2013, 2015 sup 15
Ans. The brain is made up of two hemispheres right and left. it contains about 30 billion nerve cells or neurons. The intertwined roots seen when a sad is lifted from a lawn resemble the intertwined dendrites of the neurons.
Q.7. Explain the storage system of the brain.
Ans. The brain stores each memory in several place so that if one part of the brain cells are destroyed the memory isn’t lost and can be retrieved from other place when needed.