Blood, Circulatory and Respiratory System

The __________ system carries oxygen and nutrients to all parts of our bodies.

• respiratory

• circulatory

What is the main organ of our circulatory system?

• heart

• lungs

• skin

• liver

In what part of the body are red blood cells made?

• arteries

• veins

• bone marrow

• heart

How many chambers does the heart have?

• 1

• 2

• 3

• 4

Red blood cells hold onto O₂ with the protein ________ which needs the element ________.

• hemoglobin, phosphorus

• hemoglobin, iron

• myoglobin, phosphorus

• myoglobin, iron

This part of blood helps it clot, when you get cut.

• Red blood cells
• Plasma
• Platelets
• White blood cells

_______ is/are made mostly of water and makes up about 55% of the blood

• Plasma

• Platelets

• Red blood cells

• White blood cells

The small blood vessels where exchange of O₂ and CO₂ occurs are called...

• arteries

• capillaries

• veins

• heart

The part of the lungs where gas exchange occurs is/are called.

• trachea

• bronchi

• bronchioles

• alveoli

The four parts of the blood are

• plasma, platelets, red blood cells, white blood cells
• plasma, blue blood cells, white blood cells, red blood cells
• ventricle, atrium, vein, artery