10th grade human body and health

Question 1

Why are reflexes useful?

• A. They let us think carefully first
• B. They are slow and careful
• C. They only happen when we sleep
• D. They are fast and automatic, protecting the body from harm

Question 2

In a control system, what role do these play: the thermoregulatory centre in the brain?

• A. receptor
• B. coordination centre
• C. effector

Question 3

A room thermostat switches the heating on when the room gets cold and off when it warms up. How is this like homeostasis?

• A. It uses negative feedback to keep conditions near a set point
• B. It has no sensor
• C. It changes the set point every minute
• D. It uses positive feedback to keep heating forever

Question 4

Coordination and control: which statement is true?

• A. Insulin raises blood glucose.
• B. Reflex actions are controlled by conscious thought.
• C. Normal human body temperature is about 37 °C.
• D. Hormones travel along nerves.

Question 5

Two people drank the same glucose drink. Blood glucose (mmol/L): A: 5 → peak 7 at 30 min → 5 at 2 h. B: 5 → peak 12 at 60 min → 10 at 2 h. Which person most likely has diabetes?

• A. Person A, because glucose returned to normal
• B. Neither, because glucose always rises after a drink
• C. Person B, because glucose rose much higher and stayed high
• D. Both, because glucose rose in both

Question 6

When does this happen: sweating?

• A. response when too hot
• B. response when too cold

Question 7

In a ruler-drop test, a student's reaction times were 0.19 s, 0.21 s, 0.25 s. What is the mean reaction time, in s? Give 2 decimal places.

Answer s

Question 8

A student's reaction time is longer after staying up late. This shows reaction time can be affected by…

• A. blood group
• B. tiredness
• C. shoe size
• D. eye colour

Question 9

Why does shivering warm you up?

• A. It shakes cold air away
• B. It widens blood vessels
• C. Rapid muscle contractions increase respiration, which releases heat
• D. It makes sweat

Question 10

Does this describe the nervous system or the endocrine system: slower but longer-lasting effects?

• A. nervous system
• B. endocrine (hormonal) system

Question 11

Which gland releases growth hormone?

• A. pituitary gland
• B. adrenal glands
• C. testes
• D. ovaries

Question 12

Which organ releases insulin?

• A. stomach
• B. pancreas
• C. liver
• D. kidney

Question 13

Homeostasis: which statement is NOT true?

• A. Receptors carry out the response.
• B. Effectors can be muscles or glands.
• C. Body temperature is kept close to 37 °C.
• D. In negative feedback, a rise in a value triggers changes that lower it.