Which of the following statements are correct for chemical synapse?

(i) Pre and postsynaptic neurons are separated by fluid-filled synaptic cleft.

(ii) Bidirectional conduction of impulses.

(iii) Presence of synaptic vesicles in the axon terminals.

(iv) The membranes of presynaptic and postsynaptic neurons are in close proximity.

Assertion (A) : An injury to Medulla Oblongata causes sudden death.

Reason (R) : Medulla Oblongata contains vital nuclei which control heartbeat and respiration.

How many of the following statements are correct?

(i) Centres for vomiting, gastric secretions and cardiovascular reflexes are located in the medulla.

(ii) The third ventricle passes through the midbrain.

(iii) Neural cell bodies are concentrated in the cerebral cortex.

(iv) Destruction to the cerebellum causes tremors, slurring of speech and inability to perform coordinated movements.

Following is the figure of a sagittal section of the human brain. Match the labelled parts with the respective statements given below and select the correct option.
(i) Consists of fibre tracts that interconnect left and right hemispheres.
(ii) Secretes a hormone melatonin.
(iii) Alcohol interferes with the function of this part.
(iv) Contains centres which control respiration, cardiovascular reflexes and gastric secretions.