Circulatory System

Question 1

Function of circulatory system

Answer 1

The circulatory system’s job
is to distribute oxygen and
nutrients throughout the
body and collect waste
materials via the
bloodstream.

Question 2

3 main components:

Answer 2

1. Blood
2. Blood vessels
3. Heart

Question 3

Blood

Answer 3

Blood is a collection of cells
that have been specialized to
perform a set of particular tasks

And even though it is a liquid,
it is considered to be a
connective tissue

Question 4

What’s in human blood

Answer 4

1. Plasma (liquid)
2. Red Blood Cells
3. White Blood Cells
4. Platelets

Question 5

Blood Vessels

Answer 5

Arteries: Vessels that carry blood away from the heart.

Veins: Vessels that carry blood towards the heart.

Capillaries: Tiny vessels that can only accommodate one
red blood cell at a time. Nutrients, wastes, water and gases are exchanged through the capillaries via diffusion.

Question 6

Arteries

Answer 6

Arteries are large blood vessels that carry blood away
from the heart to cells and tissues

Arteries have thicker muscular and elastic walls

High pressure, blood travels quickly in spurts (use this to
measure pulse)

Question 7

Veins

Answer 7

Blood returns to the heart through blood vessels called
veins

The walls of veins are thinner and less muscular

Low blood pressure, blood moves very slowly

Question 8

Capillaries

Answer 8

Capillaries are the smallest blood vessel in the body

The capillary wall is made up of a thin, single layer of cells

The diameter is so small that red blood cells must travel through capillaries in single file

Blood pressure approaches almost zero

Blood moves very slowly to allow exchange:

Nutrients and oxygen to pass out of the blood into body
cells and tissues

Waste products and carbon dioxide pass from body cells and tissues into the blood

Question 9

Heart

Answer 9

The heart is the engine of the circulatory system. The
heart’s job two-fold:

To pump blood to the lungs so that tissues can receive
oxygen.

To pump blood to the rest of the body, so that all of the body’s cells can receive oxygen.

• The heart is made up of two chambers that receive blood called atria, and two chambers that pump blood are called ventricles.

Question 10

Chambers of the heart

Answer 10

Each pump contains two chambers:

an atrium

a ventricle

Heart has four chambers total

Blood flows from atrium 🡪 ventricle

Question 11

Heart as a “Double-Pump”

Answer 11

Right pumps
blood to the
lungs

Left pumps
blood to the
body