Ccxcxc

Homework about the brain
“How the brain works”
What is the brain?
The brain controls both involuntary, or "lower," actions, such as heart rate, respiration, and digestion. Complex, or "higher," mental activity, such as thought, reason, and abstraction, is consciously controlled.
The brain is the center of the nervous system in animals. All vertebrates, and the majority of invertebrates, havea brain. Some "primitive" animals such as jellyfishes and starfishes have a decentralized nervous system without a brain, while sponges lack any nervous system at all.
In vertebrates, the brain is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing, balance, taste, and smell. The human brain appears to have no localized center of consciouscontrol. The brain seems to derive consciousness from interaction among numerous systems within the brain.
The human brain controls the central nervous system by way of the cranial nerves and spinal cord, the peripheral nervous system and regulates virtually all human activity. The brain is made up of over 100 billion nerve cells with each brain cell connected to around 10,000 other cells, whichequals around 1000 trillion connections in your brain. Your brain is actually very soft, jelly-like, and not grey but a deep red in color.
How long is the spinal cord and how much does it weigh?
The average spinal cord is 45 cm long in men and 43 cm long in women. The spinal cord weighs approx. 35 grams.
How much does the brain weigh?
The human brain weighs on average three pounds, or 1.5kg.
How much oxygen does the brain need to stay "conscious"?
An adults brain requires around 20% of the body's oxygen.
How much blood is needed by the brain?
Approximately 20% of the blood flowing from the heart is pumped to the brain. The brain needs constant blood flow in order to keep up with the heavy metabolic demands of the neurons.
What is the largest part of the brain?
Thebiggest part of the brain is the cerebrum which makes up 85% of the brain's weight. The cerebrum is the thinking part of the brain and it controls your voluntary muscles.
What are studies of the brain called?
The study of the brain and its functions is known as neuroscience.
Psychology is the scientific study of the mind and behavior.
Neurophysiology is the study of normal healthy brainactivity.
Neurology and psychiatry are both medical approaches to the study of the mind and its disorders and pathology or mental illness respectively.
What is a neuron?
A neuron is a nerve cell in the brain. The human brain is made up of approximately 100 billion (100,000,000,000) neurons.
Is the brain an organ?
The brain is an organ as it controls the functions of the body. It is sometimesreferred to as a muscle of thinking as the brain actually tells your muscles what to do. The brain is the most important organ in the body because it controls all of the bodily functions as well as the other organs.
Do humans only use 10% of the brain?
No, we use all of our brain.
Define Consciousness
A constellation of attributes of mind such as subjectivity, self-awareness, sentience, andthe ability to perceive a relationship between oneself and one's environment.
Define Unconsciousness
An alteration of mental state that involves complete or near-complete lack of responsiveness to people and other environmental stimuli. Being in a comatose state or coma is an illustration of unconsciousness. Fainting due to a drop in blood pressure and a decrease of the oxygen supply to thebrain is an illustration of a temporary loss of consciousness.
When is the brain considered dead?
Brain death is the irreversible end of all brain activity (including involuntary activity necessary to sustain life) due to total necrosis of the cerebral neurons following loss of blood flow and oxygenation. A brain-dead individual has no clinical evidence of brain function upon physical...