(i) The spinal cord is connected to the periphery through __________ pairs of spinal nerves. 

Complete the following statements with appropriate options :

(i) The spinal cord is connected to the periphery through __________ pairs of spinal nerves. 

(A) 25 

(B) 13 

(C) 31

(ii) The chemical substances secreted by endocrine glands are called __________ 

(A) hormones 

(B) neurons 

(C) axons

(iii) Hyposecretion of thyroxin leads to cretinism among __________ 

(A) old people 

(B) children 

(C) adults

(iv) In the case of __________, a person loses his weight and experiences irritated mood, sleeplessness as well as sweaty palms. 

(A) Myxedema 

(B) Acromegaly 

(C) Grave’s disease

(v) __________ is secreted by the pancreas. 

(A) Glycogen 

(B) Cortisone 

(C) Progesterone