C4L1 - Body Flashcards
What is the role of the cardiovascular system?
The cardiovascular system:
1) delivers needed substances to cells
2) carries wastes away from cells and
3) helps regulate body temperature
4) fights disease
About how many times does your heart beat in a week? In a year?
In a week – 700,000 times
In a year – 36, 500,000
A child’s heart is about the size of what?
the size of a fist.
What is the role of the heart?
The heart pumps blood to the body through blood vessels.
The heart has a right side and left side that are completely separated by a wall of tissue called what?
The septum separates the right side and left side of the heart.
Each side of the heart has two chambers. Each upper chamber is called what?
Atrium
The atrium does what?
The atrium receives blood that comes into the heart.
Each lower chamber is called what?
Ventricle
What does the ventricle do?
The ventricle pumps blood out of the heart.
Valves separate the atria from the
ventricles.
What is a valve?
A valve is a flap of tissue that prevents blood from flowing backward.
Valves also separate the ventricles and the large _________ ___________ that carry blood away from the heart.
blood vessels
What are the six steps of how the heart works?
1) the heart muscle relaxes and the atria fills with blood.
2) the atria contract squeezing blood through the valves
3) then the blood moves into the ventricles
4) the ventricles contract
5) squeezes blood into the large blood vessels
6) the valves between the ventricles and blood vessels snap shut
The ______________ sends out signals that make the heart muscle contract.
pacemaker
In the first loop, blood travels from the heart to the _______ and then back to the ________.
lungs and then back to the heart
