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What is a neuron?
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Draw a labelled diagram of a neuron.
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What is a synapse?
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How are the messages carried across a synapse? Explain with the help of a labelled diagram.
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Name two systems which taken together perform the functions of control and coordination in human beings.
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What does the central nervous system in humans consist of? What is the job of the central nervous system?
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The number of pairs of nerves which arises from the spinal cord is:
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The spinal cord originates from:
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The junction between two adjacent neurons is called :
(a) nerve junction
(b) sensory junction
(c) synapse
(d) neuro-muscular joint
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The life processes in humans are controlled and regulated by :
(a) reproductive and endocrine systems
(b) respiratory and nervous systems
(c) endocrine and digestive systems
(d) nervous and endocrine systems
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Electrical impulse travels in a neuron from:
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In a synapse, chemical signal is transmitted from :
(a) axon to cell body of the same neuron
(b) cell body to axon end of the same neuron
(c) dendrite end of one neuron to axon end of adjacent neuron
(d) axon end of one neuron to dendrite end of adjacent neuron
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In a neuron, the conversion of electrical signal to a chemical signal occurs at/in:
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The human body contains a large number of cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells through which electric impulses can pass by the release of a chemical substance.
(a) What are cells A?
(b) What is the name of (i) branch B, and (ii) branches C?
(c) What is the microscopic gap D known as?
(d) What is the function of cells like A in the human body?
(e) The cells A are of three types. name the three types.
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| The organ A which is located inside the skull of our body is protected by a bony box B and it is surrounded by three membranes C. The space between the membranes is filled with a liquid D which protects the organ A from mechanical shocks. The organ A in combination with another organ E makes up the central nervous system. |
- What is organ A?
- What are B, C and D?
- Name the organ E.
- While walking barefooted, if we happen to step on a sharp piece of stone, we immediately lift our foot up. Which of the two organs, A or E, is directly involved in this action?
- If we step out from a darkened room into bright sunshine, we close our eyes for a moment. Which of the two organs, A or E, is directly involved in this action?
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Explain why the tongue may be considered as both a receptor and an effector organ.
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State whether the following statement is true or false:
Copper sulphate crystals are always wet due to the presence of water of crystallisation in them.
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Which of the following salt has a blue colour and why?
CuSO4.5H2O or CuSO4
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Write the chemical name and formula of common salt.
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What are the two main ways in which common salt (sodium chloride) occurs in nature?
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