Tag: biology
Questions Related to biology
The chemicals which are released at the synaptic junction are known as
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Cerebrospinal fluid
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Hormones
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Neurotransmitters
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Lymph
Neurotransmitters are the brain chemicals that communicate information throughout our brain and body. They relay signals between nerve cells called as neurons. They are the chemicals which allow the transmission of signals from one neuron to the next across synapses. They are also found at the axon endings of motor neurons, where they stimulate the muscle fibres. So, the correct answer is option C.
Select the option responsible for restoring resting membrane potential of a neuron
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Voltage gated ${ Na }^{ + }$ channels
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Voltage gated ${ K }^{ + }$ channels
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Leaky channels for ${ K }^{ + }$
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${ Na }^{ + }/{ K }^{ + }$ pump
The Sodium-Potassium pump is the process of moving sodium and potassium ions across the cell membrane is an active transport process involving the hydrolysis of ATP to provide the necessary energy. It involves an enzyme referred to as Na+/K+.
Nerve impulse generation is a
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Physical process
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Chemical process
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Effected process
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Electro-chemical process
In thinking and response to external stimulus the brain take time about
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Less than 1/10th sec
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1/10th sec
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More than 1/10th sec
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About 1 sec
The human nervous system is highly developed. The external stimulus leads to generation of impulse. This impulse is conducted through sensory neurons and the response is given by the effector organ on receiving the answer given by the brain. The time taken by the brain and the nervous system to give the response is considered as in fraction of a second. So, the correct answer is option B.
You are watching a horror movie and you notice your heart is beating fast and mouth is dry; it is because
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Fight and flight response
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Autonomic nervous system
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Sympathetic nervous system
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Both A and C
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Release of acetylcholine
Sight of delicious food usually makes mouth watery, it is a
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Hormonal response
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Neural response
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Optic response
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Olfactory response
The response to food begins even before food enters the mouth. The first phase of ingestion, called as the cephalic phase, is controlled by the neural response to the stimulus provided by food. All aspects, such as sight, sense, and smell, trigger the neural responses resulting in salivation and secretion of gastric juices. The gastric and salivary secretion in the cephalic phase can also take place at the thought of food. The central nervous system prepares the stomach to receive food.
Who discovered synapse?
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R. Y. Cahal
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Sherrington
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Otto Loewi
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None of the above
The term synapse was first discovered in 1897 by neurophysiologist Charles Sherrington. The gap between two neurons across which impulses are conducted is known as a synapse. Synapse is a structure that permits a neuron to pass an electrical or chemical signal to another cell. It is important for neuronal function.
Thus, the correct answer is option B.
Destruction of the anterior horn cells of the spinal cord would result in loss of
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Sensory impulses
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Voluntary motor impulses
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Commissural impulses
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Integrating impulses.
Anterior horn cells are the ventral (front) grey matter section of the spinal cord which contains motor neurons that affect the skeletal muscles. It is also known as anterior grey column, ventral horn. The anterior grey column is the column where the cell bodies of alpha motor neurons are located. The destruction of the anterior horn cells of the spinal cord would result in loss of voluntary motor impulses because it is mainly related to motor impulses.
Which of the following explains drought?
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Low rainfall than requirement
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High rainfall than requirement
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Low pressure in atmosphere
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High pressure in atmosphere
After fertilization, ............ develops into seed and ............ into fruit.
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Ovary, Ovule
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Ovule, Ovary
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Embryo sac
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Egg cell
Fertilization occurs when one of the sperm cells fuses with the egg inside of an ovule. After fertilization occurs, each ovule develops into a seed. Each seed contains a tiny, undeveloped plant called an embryo. The ovary surrounding the ovules develops into a fruit that contains one or more seeds.