Biology The Heart

INTRODUCTION AND HEART CIRCULATION

What mechanism ensures that the blood is continuously flowing through the bodies of humans and animals?

• Valves are present in blood vessels that push the blood along

• The heart is a pump that pushes blood along making it flow

• A magnetic force in the heart pulls blood to itself.

• Blood does not flow. It stays in the same place throughout the body.

INTRODUCTION AND HEART CIRCULATION

In diagrams or ilustrations of the heart, blue colour represents _____________ blood.

a) oxygenated

b) deoxygenated

INTRODUCTION AND HEART CIRCULATION

In diagrams or ilustrations of the heart, RED colour represents _____________ blood.

a) oxygenated

b) deoxygenated

INTRODUCTION AND HEART CIRCULATION

If purple colour is seen on diagrams, it means the blood is _______ between the two states; oxygenated state----> deoxygenated.

• fully oxygenated
• in transition
• completely deoxygenated
• stagnant

STRUCTURE OF THE HEART: MUSCLE TYPE

The heart is made of a special type of muscle cells called _________ muscle

• cardiac
• skeletal
• smooth
• striated

STRUCTURE OF THE HEART

How are cardiac muscle cells suited for their role/function?

• They are long so the blood cam be pumped for longer distances.

• Cardiac muscles contract and relax constantly without getting tired

• They are able to pump blood without contracting and relaxing.

• The relax for long periods of time, giving the heart time to recover.

HOW THE HEART WORKS?

The beating of the heart is rhythmic, referred to as _______

• lub-lub

• dub-dub

• lub-dub

• boom-boom

HOW THE HEART WORKS?

• The beating of the heart is rhythmic, referred to as lub-dub.

  • The (a)______ is the first part of the heart beat and the (b)______ is the second part of the heart beat

• a) lub

  b) dub

• a) dub

  b) lub

• a) boom

  b) bam

• None of these

STRUCTURE OF THE HEART: SIDES OF THE HEART

The heart has (a) ______ sides.

3 and 4 are the (b) _______ side.

1and 2 are the (c) ______ side.

• (a) 4

  (b) right

  (c) left

• (a) 4

  (b) left

  (c) right

• (a) 2

  (b) right

  (c) left

• (a) 2

  (b) left

  (c) right

STRUCTURE OF THE HEART

The two sides of the heart are separated by the _______ which is made of muscles and fibres.