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In high school, science students will look at how organisms use nerves and hormones. This quiz looks in particular at how nerves and hormones carry messages around the body.
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The nervous system enables humans to react to their surroundings and coordinate their behavior. Receptors detect stimuli outside the body and relay messages to the central nervous system and brain for processing. Certain actions are voluntary, like walking or waving your hand, and are dealt with by the brain. Others are automatic and save the body from harm e.g. pulling your hand away from fire or your pupils closing up when a light is too bright. These are called reflexes and the messages from the sensors are processed in the central nervous system without needing the brain. Other messages are automatic too, like the ones telling the heart muscles to contract and relax. These are autonomous and continue all of the time.
The body also needs to control its temperature, ion content, water content and blood sugar levels. The nervous system plays its part but most of the control is done by hormones. They have a longer lasting effect and act more widely than a nerve or group of nerves. Hormones are secreted by glands and can spread throughout the body in the bloodstream. It is therefore possible for hormones to reach every cell in the body. If a cell has the right receptor chemicals, a hormone molecule will attach itself to the cell and make the cell carry out a specific action.
For example, if the blood sugar (glucose) level is high, the pancreas has cells that secrete the hormone insulin. This mixes with the blood plasma and is distributed around the body. The target organ for insulin is the liver, where glucose is changed into glycogen which can be stored and used to replenish blood sugars when the level is low. So you can see how nerves and hormones are used to carry messages around our bodies.
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1.
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The central nervous system in humans is made up from what? |
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[ ] |
Only the spinal cord |
[ ] |
Only the brain |
[ ] |
Both the spinal cord and the brain |
[ ] |
The spinal chord, brain and relay neurones |
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|
2.
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What do we call the type of neurone that sends a message from the central nervous system to a gland? |
|
[ ] |
Sensory |
[ ] |
Relay |
[ ] |
Motor |
[ ] |
Axial |
|
|
3.
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In a reflex action, what do we call the type of neurone which allows the message from the receptor to go directly to the effector without needing to go to the brain first? |
|
[ ] |
Sensory |
[ ] |
Relay |
[ ] |
Motor |
[ ] |
Axial |
|
|
4.
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The messages are transmitted across the gap from one nerve cell to another. Which of the following pairs of words give the name for the gap and how the messages are transferred from one nerve cell to the next? |
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[ ] |
Dendrite, chemical |
[ ] |
Dendrite, electrical |
[ ] |
Synapse, chemical |
[ ] |
Synapse, electrical |
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5.
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Which of the following statements about the nervous system and hormones is incorrect? |
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[ ] |
When compared to control via the nervous system, hormones act faster but their effects last longer |
[ ] |
When compared to control via the nervous system, hormones act more slowly and their effects last longer |
[ ] |
The effectors of the nervous system are muscles or glands, the effectors for hormones are target cells, tissues and organs |
[ ] |
The response of control by the nervous system is a muscle contraction or hormone secretion, the response to hormones is a chemical change in the body |
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6.
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Which of the following statements about insulin is correct? |
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[ ] |
Insulin is secreted by the liver and transported to the pancreas where it changes sugar into starch |
[ ] |
Insulin is a catalyst that destroys glucose in the blood |
[ ] |
Insulin is a hormone that helps to regulate the water content of the blood |
[ ] |
Insulin is secreted by the pancreas and it stimulates cells in the liver to convert glucose into glycogen |
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7.
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What are the missing words in the correct order from this description of a reflex action?
1. A ______ detects a stimulus.
2. A sensory neurone sends impulses to a ______ neurone.
3. A motor _______ sends impulses to an effector.
4. An effector produces a ________. |
|
[ ] |
sensory, effector, relay, response |
[ ] |
receptor, relay, neurone, response |
[ ] |
finger, motor, sensory, receptor |
[ ] |
receptor, neurone, response, receptor |
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8.
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When you are too hot or too cold, the brain sends nerve messages to the skin to do several things. Which one of the following is not a response used to control body temperature? |
|
[ ] |
Tiny hairs on the skin can be raised and lowered by small muscles |
[ ] |
Blood vessels in the skin can be dilated or contracted |
[ ] |
Glands in the skin are stimulated to release greater quantities of natural oils onto the surface of the skin |
[ ] |
Glands in the skin are stimulated to release sweat |
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9.
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Why is it important to maintain an even temperature of 37oC for the human body? |
|
[ ] |
It is a nice temperature to be at |
[ ] |
It is an easy temperature to maintain |
[ ] |
When life first started, that was the temperature of the Earth |
[ ] |
The enzymes in the body work most efficiently at that temperature |
|
|
10.
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The main method of controlling the amount of water in the body is via the kidneys. How does this happen? |
|
[ ] |
A hormone is used to send a message to the kidney to excrete more water |
[ ] |
Nerve impulses from the brain are used to send a message to the kidney to excrete more water |
[ ] |
Both of the above |
[ ] |
No message is needed, it will happen automatically |
|
|
1.
|
The central nervous system in humans is made up from what? |
|
[ ] |
Only the spinal cord |
[ ] |
Only the brain |
[x] |
Both the spinal cord and the brain |
[ ] |
The spinal chord, brain and relay neurones |
|
|
2.
|
What do we call the type of neurone that sends a message from the central nervous system to a gland? |
|
[ ] |
Sensory |
[ ] |
Relay |
[x] |
Motor |
[ ] |
Axial |
|
|
3.
|
In a reflex action, what do we call the type of neurone which allows the message from the receptor to go directly to the effector without needing to go to the brain first? |
|
[ ] |
Sensory |
[x] |
Relay |
[ ] |
Motor |
[ ] |
Axial |
|
|
4.
|
The messages are transmitted across the gap from one nerve cell to another. Which of the following pairs of words give the name for the gap and how the messages are transferred from one nerve cell to the next? |
|
[ ] |
Dendrite, chemical |
[ ] |
Dendrite, electrical |
[x] |
Synapse, chemical |
[ ] |
Synapse, electrical |
|
|
5.
|
Which of the following statements about the nervous system and hormones is incorrect? |
|
[x] |
When compared to control via the nervous system, hormones act faster but their effects last longer |
[ ] |
When compared to control via the nervous system, hormones act more slowly and their effects last longer |
[ ] |
The effectors of the nervous system are muscles or glands, the effectors for hormones are target cells, tissues and organs |
[ ] |
The response of control by the nervous system is a muscle contraction or hormone secretion, the response to hormones is a chemical change in the body |
|
|
6.
|
Which of the following statements about insulin is correct? |
|
[ ] |
Insulin is secreted by the liver and transported to the pancreas where it changes sugar into starch |
[ ] |
Insulin is a catalyst that destroys glucose in the blood |
[ ] |
Insulin is a hormone that helps to regulate the water content of the blood |
[x] |
Insulin is secreted by the pancreas and it stimulates cells in the liver to convert glucose into glycogen |
|
|
7.
|
What are the missing words in the correct order from this description of a reflex action?
1. A ______ detects a stimulus.
2. A sensory neurone sends impulses to a ______ neurone.
3. A motor _______ sends impulses to an effector.
4. An effector produces a ________. |
|
[ ] |
sensory, effector, relay, response |
[x] |
receptor, relay, neurone, response |
[ ] |
finger, motor, sensory, receptor |
[ ] |
receptor, neurone, response, receptor |
|
|
8.
|
When you are too hot or too cold, the brain sends nerve messages to the skin to do several things. Which one of the following is not a response used to control body temperature? |
|
[ ] |
Tiny hairs on the skin can be raised and lowered by small muscles |
[ ] |
Blood vessels in the skin can be dilated or contracted |
[x] |
Glands in the skin are stimulated to release greater quantities of natural oils onto the surface of the skin |
[ ] |
Glands in the skin are stimulated to release sweat |
|
|
9.
|
Why is it important to maintain an even temperature of 37oC for the human body? |
|
[ ] |
It is a nice temperature to be at |
[ ] |
It is an easy temperature to maintain |
[ ] |
When life first started, that was the temperature of the Earth |
[x] |
The enzymes in the body work most efficiently at that temperature |
|
|
10.
|
The main method of controlling the amount of water in the body is via the kidneys. How does this happen? |
|
[x] |
A hormone is used to send a message to the kidney to excrete more water |
[ ] |
Nerve impulses from the brain are used to send a message to the kidney to excrete more water |
[ ] |
Both of the above |
[ ] |
No message is needed, it will happen automatically |
|
|