science

Question 1

endocrine system?

Answer 1

-not have ducts,
- secretory product hormones
Secretory products are released into the bloodstream, eventually reaching the target organ.
example- Thyroid glands,

Question 2

exocrine system

Answer 2

-have ducts
-secretory products- Sweat, enzymes, mucus
Secretory products are released to an internal organ or the external surface through a duct.
examples, Salivary glands, liver

Question 3

Hypothalamus

Answer 3

This gland is located in brain, controls your endocrine system. uses information from nervous system to determine when to tell other glands.

Question 4

what hypothalamus controls

Answer 4

your mood, hunger and thirst, sleep patterns and sexual function

Question 5

stimulus-response

Answer 5

-Mechanoreceptors
-photoreceptor.
-Thermoreceptor
-Chemoreceptor

Question 6

Describe the importance of the following in homeostasis and the stimulus–response model.
a. Receptor

Answer 6

The receptor detects a change in a variable. If change is outside a set range, it communicates.

Question 7

Effector

Answer 7

organs that respond to a change in a variable and initiate a response, in homeostasis this involves
a response to bring back within a normal set range.

Question 8

Control centre

Answer 8

Once stimulus or change in variable is detected by a receptor, the control Centre receives this message and sends a message to an appropriate effector

Question 9

Explain the difference between a positive and negative feedback system

Answer 9

Negative feedback occurs when a response is in the opposite direction of the stimulus, restoring the variable to its set range through a homeostatic mechanism. Positive feedback is an amplification of change in a
variable, moving it further from the set point.

Question 10

Eating chocolate and releasing insulin

Answer 10

negative feedback

Question 11

state the function of a sensory neuron

Answer 11

Sensory neurons are present in receptors and detect changes in the environment

Question 12

what is the order of flow chart

Answer 12

stimulus-receptor-control centre-effectors-response

Question 13

You open the curtains and notice the change in light

Answer 13

eyes and photoreceptors

Question 14

On a spring afternoon, a cool breeze causes goosebumps to appear on your arms

Answer 14

skin and thermoreceptors

Question 15

When someone leaves a gas tap on in the science labs, a smell fills the room.

Answer 15

nose and chemoreceptors

Question 16

When you eat a large meal you feel full

Answer 16

stomach and mechanoreceptors

Question 17

Strawberries have a lovely smell and they taste great too!

Answer 17

nose, tongue and chemoreceptors

Question 18

The school bell signals that it’s time for lunch

Answer 18

ears and mechanoreceptors

Question 19

Speed of message

Answer 19

nervous system
fast
endocrine system-
slow

Question 20

speed of response

Answer 20

endocrine system-
usually slow
nervous system-
immediate

Question 21

Duration of response

Answer 21

endorcrine-
longlasting
nervous-
short

Question 22

spread of response

Answer 22

endocrine- usually slow
nervous- very localised

Question 23

Spread of response

Answer 23

In circulatory system — in
Hormones (chemicals)
bloodstream
In nervous system — along nerves and across sypnase

Question 24

Type of message

Answer 24

endocrine- hormones
nervous-electrical impulses

Question 25

What is a reflex action?

Answer 25

A reflex action is an action that occurs without conscious thought.
It is a survival mechanism.

Question 26

Describe a situation in which a reflex action would be useful

Answer 26

when your hand touches a very hot surface, or when an object flies quickly in your eyes

Question 27

Which part is located in the back of the brain?

Answer 27

cerebellum

Question 28

Which part is sometimes called the medulla?

Answer 28

brain stem

Question 29

Which part controls memory and speech

Answer 29

cerebellum

Question 30

Which part controls involuntary thoughts

Answer 30

brain stem

Question 31

Which part consists of two hemispheres?

Answer 31

cerebrum

Question 32

Where are these three parts located?

Answer 32

hind brain and fore brain

Question 33

what is valency

Answer 33

The valence (or valency) of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.

Question 34

bodies defense barriers

Answer 34

1. physical-skin and mucos
2. chemical barriers- the body produces chemicals such acid
3. cellular barriers

Question 35

3 line of defnese

Answer 35

1 physical and chemical
2 non-specific innate response
3. specific adaptive response