Grade 8 · Science · Unit 2 of 8
Heart & Blood
How blood keeps the body in balance
What your child practises
The heart, blood vessels and blood, how the circulatory system delivers oxygen and removes waste, and how it helps the body stay in balance.
Manitoba Curriculum learning outcome: SCI.8.E.22, SCI.8.E.23 · homeostasis and the structure and function of the circulatory system
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
When you exercise, your heart rate…
- goes down
- stops
- goes up
Show answer
goes up
Hint: Muscles need more oxygen, so the heart pumps faster.
Question 2
When you are too hot, the vessels near the skin…
- become bone
- disappear
- widen so more heat can escape
- close so no heat leaves
Show answer
widen so more heat can escape
Hint: This is part of temperature regulation.
Question 3
Which is a healthy habit for the circulatory system?
- smoking
- eating a balanced diet
- avoiding all water
Show answer
eating a balanced diet
Hint: A healthy diet helps keep vessels clear.
Question 4
Why do we feel warm after running?
- the Sun is nearer
- blood stops moving
- the body makes heat and blood carries it to the skin
- bones make heat
Show answer
the body makes heat and blood carries it to the skin
Hint: Blood helps control temperature.
Question 5
White blood cells help the body…
- digest food
- fight infection
- carry oxygen
Show answer
fight infection
Hint: They protect against germs.
Question 6
Cells need a steady supply of blood because they…
- do not make waste
- are made of blood
- need oxygen and nutrients to make energy through cellular respiration
- cannot use water
Show answer
need oxygen and nutrients to make energy through cellular respiration
Hint: Cellular respiration uses oxygen and glucose.