Match List I with List II. 

	List I		List II
A.	Heroin	I.	Effect on cardiovascular system
B.	Marijuana	II.	Slow down body function
C.	Cocaine	III.	Painkiller
D.	Morphine	IV.	Interfere with transport of dopamine

Choose the correct answer from the options given below.

	A	B	C	D
1.	III	IV	I	II
2.	II	I	IV	III
3.	I	II	III	IV
4.	IV	III	II	I

A-II, B-I, C-IV, D-III

A. Heroin is a semisynthetic opioid drug. It binds to opioid receptors in the brain and spinal cord, which results in the suppression of various bodily functions. Heroin use can cause a sedating and depressant effect on the body, leading to slowed breathing, decreased heart rate, and overall reduced body function.

B. Marijuana contains cannabinoids, including THC (delta-9- tetrahydrocannabinol). When consumed, THC can produce effects on the cardiovascular system. It can cause an increase in heart rate and blood pressure, which can put additional strain on the heart.

C. Cocaine is a stimulant drug that affects the brain’s reward system. It acts by blocking the reuptake of dopamine, leading to increased dopamine levels in the brain. By interfering with the transport of dopamine, cocaine produces intense feelings of euphoria and pleasure, contributing to its addictive properties.

D. Morphine is an opioid durg, commonly used as a painkiller (analgesic). It acts on the opioid receptors in the central nervous system, blocking pain signals and producing pain relief. Morphine is often prescribed for the treatment of post-surgical pain or cancer-related pain.