Tag: impulse and its transmission

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Questions Related to impulse and its transmission

Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

Muscles cell are branched. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cardiac muscle cells are branched, but skeletal muscle cells are cylindrical and unbranched. Since the question refers to muscle cells generally, the statement is false as it does not apply to all muscle types.

Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

Conduction of nerve impulse is 

  1. Faster in non-myelinated fibres

  2. Faster in myelinated fibres

  3. No difference in the rate of conduction in myelinated and non -myelinated fibres.

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Conduction of nerve impulse is faster in myelinated fibres as myelin is an insulating layer or sheath, that forms around nerves, including those in the brain and spinal cord which protect and insulates the axons thus enhance the transmission of electrical impulses.

So, the correct answer is option B.

Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

Axon is characterised by

  1. Transformation of energy

  2. Receiving the impulse

  3. Providing energy for impulse

  4. Conduction of impulse
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Axon is the long slender part of the neuron. It conducts nerve impulse from the dendron towards the synapse. So, option D is the correct answer.

Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

The gap between two neuron is _____

  1. 2-20 nm

  2. 25-30nm

  3. 150-200nm

  4. 50-60nm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The gap between 2 neurons is called synapse. This signal between two neuron is passes when this synapse is filled with neurotransmitter. The size of the synapse ranges from 2-20 nm.

Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed would drive

  1. $Na^{+}$ into the cell
  2. $Na^{+}$ out of the cell
  3. $K^{+}$ into the cell
  4. $K^{+}$ and $Na^{+}$ out of the cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is option A i.e. "Na+ into the cell"
In the resting state of the nerve cell, the cytoplasm inside the axon has a high concentration of K+ and a low concentration of Na+. While, the surrounding fluid outside the axon and cytoplasm, has a low concentration of K+ and a high concentration of Na+. Thus, if diffusion occurs, then through concentration gradient the Na+ enters into the nerve cell.

Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

The dark bands (Black bands) (A-bands) of a skeletal
muscle are known as

  1. Isotropic bands

  2. Anisotropic bands

  3. Intercalated disc

  4. Cross bridges
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Each myofibril shows dark and light bands' The dark bands of the myofibril are termed as A-bands or anisotropic bands.

Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

The muscle fatigue occurs due to accumulation of

  1. Pyruvic acid

  2. ATP

  3. Lactic acid
  4. Eroman $CO _{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During muscle fatigue due to deposition of lactic acid, cytoplasm becomes acidic thereby enzyme activity stops and food is not oxidised and as the energy is not available, muscular contraction stops.

Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

The function of the gap junction is to

  1. Performing cementing to keep neighbouring cells together

  2. Facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules

  3. Separates two cells from each other

  4. Stop substance from leaking across a tissue
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A. Desmosomes perform cementing to keep the neighbouring cells together. It serve anchoring function.
B. Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells for rapid transfer of ions, small molecules and sometimes big molecules,
C. No such junction is present.
D. Tight junctions help to stop substances from leaking across the tissue. 
So, the correct answer is 'Facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules'.
Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

Which one of the following is a correct match?

  1. Nerve impulses - Transmitted from axon towards dendron

  2. Synaptic knob - Dendron

  3. Neuron - Endocrine system

  4. Nerve - Excretory system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The nerve impulses are generated at the sensory receptor and are carried towards the CNS through the sensory neuron. The The nerve impulse is transmitted through the axon of one neuron to the dendrite of the other neuron. At the axonic end, there are telodendrons which release the neurotransmitters which flow through the synapse to the dendrite of the other neuron. 

Thus, the correct answer is option A. 

Multiple choice biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

A spinal nerve takes nerve impulses:

  1. to the CNS

  2. away from the CNS

  3. both to and away from the CNS

  4. only inside the CNS
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body.  We have 31 pairs of spinal nerves and they are named after the section of the spine they come out of.

8 pairs of cervical nerves (C1-C8)
12 pairs of thoracic nerves (T1 – T12)
5 pairs of lumbar nerves (L1-L5)
5 pairs of sacral nerves (S1-S5)
1 pair of coccygeal nerves (Co1)

So, the correct answer is 'both to and away from the CNS'.