Practice MCQ Questions and answers on Biology-GK

Most doctors claim to have 12 cranial nerves, whereas humans in fact have 24 (12 pairs).

Centre of intelligence in human brain is Cerebrum.

Myelin is formed by Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS). Each Schwann cell forms a single myelin sheath around an axon.

The peripheral nervous system consists of the nerves that branch out from the brain and spinal cord. These nerves form the communication network between the CNS and the body parts. The peripheral nervous system is further subdivided into the somatic nervous system and the autonomic nervous system.

In humans, the cerebellum plays an important role in motor control. It may also be involved in some cognitive functions such as attention and language as well as emotional control such as regulating fear and pleasure responses, but its movement-related functions are the most solidly established.

The part of neuron where the information is acquired is ends of dendrites.

The basic unit of the nervous system is a nerve cell, or neuron. The human brain contains about 100 billion neurons.

The adult human brain weighs about 3 pounds (1,300-1,400 g). The adult human brain is about 2 % of the total body weight. The average human brain is 140 mm wide.
So, the correct answer is 2%.

Cerebrum is located in fore front of brain.

The smallest functional unit of the nervous system is the neuron. Neurons are specialized cells that send out neurotransmitters to other neurons.