Give the full form of the abbreviation ACTH. Which gland secretes this hormone?

Define the term Synapse. How are Cytons and Axons of neurons placed in the Cerebrum?

Name the nerve that transmits impulses to the brain from :

(a) Ear

(b) Eye

A mature mammalian erythrocyte lacks nucleus and mitochondria but is efficient in its functioning. Explain by giving suitable reasons.