the liquid component of blood, making up about 55% of its total volume, is called ______________.
oxygen - rich blood is carried away from the heart by ______________.
the component of blood that carries oxygen from the lungs to tissues is ______________.
the ______________ valve prevents blood from flowing back into the left atrium from the left ventricle.
during exercise, the circulatory system increases the heart rate to deliver more ______________ blood to the muscles.
the phase of the cardiac cycle when the ventricles contract is known as ______________.
the lub sound of the heartbeat is caused by the closing of the ______________ and mitral valves.

Question

Accepted Answer

### 1. The liquid component of blood, making up about 55% of its total volume, is called ______.
# Brief Explanations:
Blood has a liquid part (plasma) and cellular parts. Plasma is the liquid matrix, ~55% of blood volume, carrying nutrients, hormones, etc.
# Answer:
plasma

### 2. Oxygen - rich blood is carried away from the heart by ______.
# Brief Explanations:
Arteries (except pulmonary artery) carry oxygen - rich blood from heart to body. Aorta is the main artery, but generally arteries (like aorta, carotid etc.) do this.
# Answer:
arteries (or aorta, but arteries is more general)

### 3. The component of blood that carries oxygen from the lungs to tissues is ______.
# Brief Explanations:
Red blood cells (erythrocytes) have hemoglobin which binds to oxygen in lungs and releases in tissues.
# Answer:
red blood cells (or erythrocytes)

### 4. The ______ valve prevents blood from flowing back into the left atrium from the left ventricle.
# Brief Explanations:
Mitral (bicuspid) valve? No, wait, the valve between left atrium and left ventricle is mitral, but to prevent backflow from left ventricle to left atrium, it's the mitral (bicuspid) valve? Wait, no: the left atrioventricular valve is mitral (bicuspid), and it prevents backflow from left ventricle to left atrium. Wait, actually, the correct valve is the mitral (or bicuspid) valve? Wait, no, the aortic valve is between left ventricle and aorta. Wait, no: the atrioventricular valve on the left is mitral (bicuspid), which closes when left ventricle contracts to prevent backflow to left atrium.
# Answer:
mitral (or bicuspid)

### 5. During exercise, the circulatory system increases the heart rate to deliver more ______ blood to the muscles.
# Brief Explanations:
During exercise, muscles need more oxygen. So the heart pumps more oxygen - rich (or oxygenated) blood to muscles.
# Answer:
oxygen - rich (or oxygenated)

### 6. The phase of the cardiac cycle when the ventricles contract is known as ______.
# Brief Explanations:
Cardiac cycle has systole (contraction) and diastole (relaxation). Ventricular contraction is ventricular systole.
# Answer:
systole (or ventricular systole)

### 7. The ‘lub’ sound of the heartbeat is caused by the closing of the ______ and mitral valves.
# Brief Explanations:
The “lub” sound is from the closing of atrioventricular valves. On the right, it's the tricuspid valve, on the left, mitral (bicuspid). So tricuspid and mitral valves close to make “lub”.
# Answer:
tricuspid

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QUESTION IMAGE

Question

Explanation:

1. The liquid component of blood, making up about 55% of its total volume, is called ______.

Answer:

2. Oxygen - rich blood is carried away from the heart by ______.