Rearrange the following in correct sequence pertaining to what is given within brackets at the end.

(a) Effector- Sensory neuron - Receptor- Motor neuron - Stimulus - Central nervous system - Response (Reflex arc)

 

(b) Repolarization - Depolarization - Resting (polarized) (during conduction of nerve impulse through a nerve fiber)

 

(c) Axon endings- Nucleus-Dendrites-Axon - Perikaryon- Dendron (Neuron structure)

 

(d) Diencephalon -Cerebellum - Medulla oblongata - Pons - Cerebrum - midbrain (sequence of parts of the human brain).

(a) Stimulus – receptor – sensory neuron – central nervous system – motor neuron – effector – response

Explanation: In the reflex arc, sensory cells carry afferent impulses to the central nervous system, which makes contact with a motor neuron. The motor neuron carries efferent impulses to the effector, which produces the response.

(b) Resting – depolarization – repolarization

Explanation: The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of electrical changes across the membrane of the neuron. The membrane of an unstimulated neuron is polarized. Thus, there is a difference in electrical charge between the outside and inside of the membrane.

(c) Dendrites – dendron – perikaryon – nucleus – axon – axon endings

Explanation: Neurons have long extensions that extend out from the cell body called dendrites and axons. Dendrites are extensions of neurons that receive signals and conduct them toward the cell body.

(d) cerebrum – diencephalon – mid-brain – cerebrum – cerebellum – pons – medulla oblongata

Explanation: The brain is made of three main parts which are the forebrain, midbrain, and hindbrain. The forebrain consists of the cerebrum, thalamus, and hypothalamus (part of the limbic system). The midbrain consists of the tectum and tegmentum. The hindbrain is made of the cerebellum, pons, and medulla.