[Part 3]- B10- the nervous system 🧠🩻

Question 1

Fill in the gaps: The ________ are only on one side of the ________ cleft which ensures the ______ can only travel in one direction. 🧠

Answer 1

• The receptors are only on one side of the synaptic cleft which ensures the impulse can only travel in one direction.

Question 2

What’s one example, of an effector ?

Hint: contracts

Answer 2

• an example of an effector, is a muscle [that contracts] or a gland [which secrets hormones]

Question 3

What’s another example of an effector ?

Hint: retains water

Answer 3

• another example of an effector could be the kidney- an organ that retains water if blood pressure is too low

Question 4

What’s an example, of how drugs can affect homeostasis ? 💊💉

Answer 4

• For example, if the brain is repeatedly altered due to addictive substances [e.g- drugs], the brain will re-balance and creates a ‘new’ balance, called allostasis.
• ; the problem, is that the brain then adapts to this unhealthy new configuration= therefore it now needs the addictive substances to maintain its new balance.

Question 5

What’s a synaptic clef?

Answer 5

• a synaptic clef, is the gap between the first and second axons

Question 6

What are the main stages of a reflex arc ?

Answer 6

• the main stages of a reflex arc are:
• stimulus—-> receptor —> sensory neurone—> coordination centre—> relay neurone—> motor neurone—> effector—> response

Question 7

What is a drug ?

Answer 7

• a drug, is a chemical substance that is administered or taken to incite a biological effect, in the body of an organism