The document contains a grade 9 science quiz focused on identifying anatomical and physiological aspects of the circulatory system and the heart. It includes questions requiring definitions, multiple-choice identifications, and true or false statements regarding the heart's structure and function. Key topics include the chambers of the heart, circulation of blood, and types of blood vessels.

1. GRADE 9 SCIENCE
QUIZ NO. 1

2. Identification: Identify what is being ask on
the following question.
• 1. It is the main circuit of the body.
• 2. It is the gas needed for respiration.
• 3. This is the protective sac of connective tissue.
• 4. It prevent the mixing of oxygen rich and oxygen poor blood.
• 5. How many chamber that hearts have?
• 6. It allows the valves to close and hold the valve flaps in place.
• 7. How many atria that circulatory system have?
• 8. What do you called the complete sequence of contraction and relaxation?
• 9. It carry the blood away from the heart.
• 10. It carry the blood towards the heart.

3. • True or False: Write TRUE if the statement is correct and FALSE if the
statement is incorrect.
• 1. Endocardium is the outermost layer and primary cardiac
muscle of the heart.
•2. Myocardium is composed of spontaneous contracting
cardiac muscle fibers.
•3. The heart can pump blood because it is made of muscle.
•4. Capillaries is the smallest blood vessels.
•5. Arteries only carry oxygen rich blood, with the exception
of pulmonary arteries.