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B5: Quiz 1 – Answers
B5: Quiz 1 – Answers
1)
a) Homeostasis is the maintaining of a constant internal environment in response to internal and external changes so that the conditions inside the body are optimal for cell/ enzyme activity
b) Any 2 from temperature, blood glucose levels, water levels, pH levels etc
c) The internal conditions need to be kept constant so that our body can function effectively; for example, so that enzymes and cells work at their optimum
2) Receptor, coordination centre, effector
3)
a) A negative feedback system ensures that when the level of something inside the body gets too high or too low, certain processes/ responses happen to bring the level back to where it should be/ the optimum
b)
a) Homeostasis is the maintaining of a constant internal environment in response to internal and external changes so that the conditions inside the body are optimal for cell/ enzyme activity
b) Any 2 from temperature, blood glucose levels, water levels, pH levels etc
c) The internal conditions need to be kept constant so that our body can function effectively; for example, so that enzymes and cells work at their optimum
2) Receptor, coordination centre, effector
3)
a) A negative feedback system ensures that when the level of something inside the body gets too high or too low, certain processes/ responses happen to bring the level back to where it should be/ the optimum
b)
c) Receptors in the body notice that the temperature is too high. The receptors respond to a change in stimuli by sending a message to the control centres. The control centres process the information from the receptors and organise a response. A message is sent from the control centres to the effectors, which produces a response that decreases the temperature of the body back to the optimal temperature
Questions
1)
a) What is homeostasis?
b) Give two conditions that need to be kept constant in the body.
c) Why do the internal conditions of the body need to be kept constant?
2) There are many automatic control systems in the body. Automatic control systems comprise of 3 parts, which are effectors, receptors and coordination centres. Place these 3 parts in order for an automatic control system bringing about a response.
3)
a) What is a negative feedback system?
b) On the graph below, draw the negative feedback graph for the internal temperature of the body against time.
1)
a) What is homeostasis?
b) Give two conditions that need to be kept constant in the body.
c) Why do the internal conditions of the body need to be kept constant?
2) There are many automatic control systems in the body. Automatic control systems comprise of 3 parts, which are effectors, receptors and coordination centres. Place these 3 parts in order for an automatic control system bringing about a response.
3)
a) What is a negative feedback system?
b) On the graph below, draw the negative feedback graph for the internal temperature of the body against time.
c) The temperature of an individual becomes too high. With reference to the effectors, receptors and coordination centres, talk about how the automatic control system brings the temperature back down to the normal/ optimal level. (You do not need to talk about what actually happens when we become too hot, such as sweeting, vasodilating etc)