Video Transcript
Mia drinks a cup of coffee. What effect will the coffee have on
her heart rate? Fill in the blank to explain your
answer. Coffee what the nervous system.
We will start by answering part one
of the question: what effect will the coffee have on her heart rate? So, how does coffee affect heart
rate? Coffee contains a chemical called
caffeine, which affects the body in a number of ways. Caffeine is a natural stimulant,
which means that it raises levels of activity in the body and makes things work
faster than normal. Stimulants like caffeine stimulate
the brain, the nervous system, and the heart. The caffeine in coffee stimulates
the heart by making it beat faster than normal, causing an increase in heart
rate.
So, what effect will Mia’s cup of
coffee have on her heart rate? It will increase it.
Now that we have answered part one,
let’s move on to answering part two, which asks us to fill in the blank to explain
why coffee increases heart rate. As we discussed earlier, the
caffeine in coffee stimulates the nervous system, making it more active than
normal. The stimulation of the nervous
system in turn stimulates the heart, causing it to beat faster. So, the missing word is
stimulates. Coffee stimulates the nervous
system.
