Tag: control and co-ordination in plants and animals
Questions Related to control and co-ordination in plants and animals
Muscles cell are branched.
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True
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False
Conduction of nerve impulse is
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Faster in non-myelinated fibres
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Faster in myelinated fibres
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No difference in the rate of conduction in myelinated and non -myelinated fibres.
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None of the above
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.
Axon is characterised by
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Transformation of energy
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Receiving the impulse
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Providing energy for impulse
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Conduction of impulse
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.
The gap between two neuron is _____
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2-20 nm
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25-30nm
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150-200nm
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50-60nm
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.
In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed would drive
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$Na^{+}$ into the cell
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$Na^{+}$ out of the cell
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$K^{+}$ into the cell
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$K^{+}$ and $Na^{+}$ out of the cell
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.
The dark bands (Black bands) (A-bands) of a skeletal
muscle are known as
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Isotropic bands
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Anisotropic bands
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Intercalated disc
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Cross bridges
Each myofibril shows dark and light bands' The dark bands of the myofibril are termed as A-bands or anisotropic bands.
The muscle fatigue occurs due to accumulation of
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Pyruvic acid
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ATP
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Lactic acid
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Eroman $CO _{2}$
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.
The function of the gap junction is to
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Performing cementing to keep neighbouring cells together
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Facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules
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Separates two cells from each other
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Stop substance from leaking across a tissue
Which one of the following is a correct match?
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Nerve impulses - Transmitted from axon towards dendron
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Synaptic knob - Dendron
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Neuron - Endocrine system
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Nerve - Excretory system
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.
A spinal nerve takes nerve impulses:
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to the CNS
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away from the CNS
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both to and away from the CNS
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only inside the CNS
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.