Q 01/05

In vertebrates the nervous system has two main parts: the central nervous system and which other?

A) Peripheral

B) Somatic

C) Endocrine

D) Lymphatic

Answer · why

A) Peripheral

The peripheral half is not shielded by the skull, the vertebral column or the blood-brain barrier, which makes it more vulnerable to injury and toxins...

Q 02/05

Neurons are typically sorted into three functional types: sensory neurons, motor neurons and what?

A) Reflex neurons

B) Interneurons

C) Bipolar neurons

D) Glial neurons

Answer · why

B) Interneurons

They connect neurons to other neurons within the same region. Sensory neurons carry signals in from the sense organs; motor neurons carry orders out t...

Q 03/05

Which part of a neuron carries impulses away from the cell body, sometimes for a metre or more?

A) The nucleus

B) The dendrite

C) The axon

D) The soma

Answer · why

C) The axon

It leaves the cell body at a swelling called the axon hillock. Dendrites, by contrast, branch profusely but only reach a few hundred micrometres.

Q 04/05

The body's longest axons belong to which nerve, running from the spine's base to the big toe?

A) Vagus

B) Phrenic

C) Femoral

D) Sciatic

Answer · why

D) Sciatic

It is also the widest single nerve in the body, formed from the L4 to S3 spinal roots. Most axons are only about a micrometre across.

Q 05/05

Along with neurons, the nervous system is built from support cells known collectively as what?

A) Fibroblasts

B) Glia

C) Chondrocytes

D) Osteocytes

Answer · why

B) Glia

They provide structural and metabolic support. Star-shaped astrocytes are the most abundant kind in the brain, and microglia act as its resident immun...