Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

Subdural space is between

  1. Piamater and arachnoid

  2. Arachnoid and duramater

  3. Piamater and grey matter

  4. Grey matter and white matter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The meninges are the coverings of the brain that are present interior to the cranium. The outermost layer is called the dura mater. The middle layer is the arachnoid mater. The pia mater is the innermost vascular layer. There is a space present between the dura mater and the arachnoid mater that is called the sub-dural space. It is filled with the serous fluid and provides mechanical support. The space between the arachnoid mater and the pia mater is called the sub-arachnoid space. It is filled with the cerebrospinal fluid.

Hence, the correct answer is 'Arachnoid and dura mater'

Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

Neurotransmitters are released at the synapse by ___________

  1. Tips of Dendrites

  2. Synaptic Knobs

  3. Organelles of Cyton

  4. Myelin sheath of Axon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Synaptic knobs, or axon terminals, contain synaptic vesicles filled with neurotransmitters that fuse with the presynaptic membrane to release their contents into the synaptic cleft upon action potential arrival.

Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

Which one of the following nerve stimulates gastric glands of secrete gastric juice and promote contractions of smooth muscles of stomach wall?

  1. Sacral spinal nerve

  2. Vagus nerve

  3. Glassopharyngeal

  4. Lumbar spinal nerve
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The vagus nerve (cranial nerve X) is the primary parasympathetic nerve that innervates visceral organs in the thoracic and abdominal cavities, stimulating gastric juice secretion and stomach wall contractions.

Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

Synaptic fatigue is due to

  1. Repeated release of acetylcholine

  2. Repeated release of adrenaline

  3. Exhaustion of neurotransmitter

  4. Exhaustion of acetyl cholinesterase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Synaptic fatigue occurs when the rate of neurotransmitter release exceeds the rate of synthesis and transport, leading to the depletion of neurotransmitters in the synaptic knob.

Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

Membrane potential of a cell forms

  1. Movement of anions into the cell

  2. Movement of cations into the cell

  3. Action of proton pump

  4. Action of an electrogenic pump.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Membrane potential is established by the unequal distribution of ions across the membrane, maintained by active transport (like the Na+/K+ pump) and the movement of ions through channels.

Multiple choice biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

The following are the parts of a neuron:
a) Axon b) Terminal branches c) Cyton d) Dendrites. 
The correct pathway of a nerve impulse through these parts are ________.

  1. badc

  2. dcab

  3. bdac

  4. adbc
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A nerve impulse travels from the dendrites to the cyton (cell body), then down the axon to the terminal branches.