HUMAN AND SOCIAL BIOLOGY for CSEC

Which part of the brain stores memories of past happenings?

• cerebellum

• cerebrum

• medulla oblongata

• hypothalamus

The central nervous system consists of the

• spinal cord and brain

• cranial nerves and spinal cord

• spinal nerves and cranial nerves

• brain and spinal nerves

Which statement concerning nerves and neurones is wrong?

• nerves are made up of neurons

• neurones are single cells

• nerves and neurones are surrounded by membranes

• a nerve and a neurone both make greater responses to a stronger stimulus

Which of the following hormones acts very quickly?

• glucagon

• adrenaline

• insulin

• oestrogen

What occurs during the transmission of an impulse in a neurone?

• an electric current passes along the axon

• the axon becomes less permeable to sodium ions

• sodium ions enter the axon

• the outside of the axon becomes positively charged

What passes across the gap of a synapse at the junction between a muscle and a spinal nerve?

• vesicles

• complex organic chemicals

• ions

• an electric current

What is the most important function of reflex actions?

• to improve learned reactions

• to coordinate different parts of the body

• to link the brain with muscle action

• to protect body parts from damage

The ability of the human body to maintain a constant internal environment is a definition of

• osmoregulation

• homeostasis

• excretion

• egestion

After spinning around several times a person feels dizzy because nerve impulses are made first in the

• oval window

• ear ossicles

• semicircular canals

• cochlea

Which is most likely damaged in a colour-blind person?

• cones of the retina

• rods of the retina

• medulla of the brain

• blind spot