Biology - Comprehensive Mock Test 19

Question 181 Medium

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

A) Perikaryon and dendrites B) Vacuoles and fibres C) Flagellum and medullary sheath D) Nucleus and mitochondria

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Question 182 Medium

The cutaneous plexus and the papillary plexus consist of ?

A) Specialized cells for cutaneous sensations B) A network of arteries to provide dermal supply C) A network of nerves to provide dermal sensation D) Gland cells that release cutaneous secretions

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Question 183 Hard

An action potential in the nerve fibre is produced when positive and negative charges on outside and the inside of the axon membrane are reversed because ?

A) all potassium ions leave the axon B) more potassium ions enter the axon as compared to sodium ions leaving it C) more sodium ions enter the axon as compared to potassium ions leaving it D) all sodium ions enter the axon

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Question 184 Medium

Which one of the following aspects is an exclusive characteristic of living things?

A) Perception of events happening in the environment and their memory B) Increase in mass by accumulation of material both on surface as well as internally C) Isolated metabolic reactions occur in vitro D) Increase in mass from inside only

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Question 185 Medium

Which one of the followings is not correct about neuroglial cells?

A) Generate or transmit impulses B) Maintain healthy concentrations of important chemicals in the fluid C) Provide physical support and protection to neurons D) In PNS, responsible for myelination (Schwann cells)

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Question 186 Medium

Which one of the followings is correct in regard to the function of cerebellum?

A) Regulate heartbeat B) Muscle coordination C) Secretes melatonin D) Sense reception

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Question 187 Medium

Which one of the following pairs is incorrectly matched in regard to the principal actions of neurotransmitters?

A) Endorphins - involved in moods B) Serotonin - involved in sleep cycle C) Norepinephrine - plays a role in emotions D) Somatostatin - inhibits pancreatic release of growth hormone

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Question 188 Medium

Which one of the following is the correct statement regarding the particular psychotropic drug specified?

A) Barbiturates cause relaxation and temporary euphoria B) Hashish causes after thought perceptions and hallucinations C) Opium stimulates nervous system and causes hallucinations D) Morphine leads to delusions and disturbed emotions

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Question 189 Medium

Which one of the common neurotransmitters is paired wrongly with the site where it is released?

A) Somatostatin - pancreas B) Serotonin - spinal cord C) Acetylcholine - Neuromuscular junctions D) Endorphins - autonomic nervous system

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Question 190 Medium

Which one of the following cranial nerves is carrying the nerve fibres originating from the Edinger-Westphal nucleus?

A) Oculomotor B) Trochlear C) Abducens D) Vagus

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