The average life span of human red blood cells is:
1. | 10 days | 2. | 120 days |
3. | 21 days | 4. | three months |
A chest pain or pressure, usually due to not enough blood flow to the heart muscle, is known as:
1. hypoxia | 2. infarction |
3. angina | 4. diaphoresis |
What is the percentage of atrial blood that flows into the ventricles without atrial systole?
1. | 90 | 2. | 70 |
3. | 50 | 4. | 30 |
What is the percentage of proteins in plasma?
1. | 10% | 2. | 7% |
3. | 25% | 4. | 92% |
The colloid osmotic pressure in the human blood is largely due to:
1. | electrolytes | 2. | albumin |
3. | fibrinogen | 4. | globulins |
QRS complexes on the ECG tracings show that:
1. The atria are depolarizing.
2. The ventricles are depolarizing.
3. The ventricles are repolarizing.
4. The heart is at rest.
The aortic semilunar valve prevents blood from returning to the _____.
1. | left ventricle | 2. | aorta |
3. | right ventricle | 4. | left atrium |
Pulmonary veins return the oxygenated blood from the lungs to:
1. | right atrium | 2. | left atrium |
3. | right ventricle | 4. | left ventricle |
Erythrocytes in humans are destroyed mainly in:
1. | liver and spleen | 2. | heart and lungs |
3. | bone marrow | 4. | kidney |
The most common WBC under normal physiological conditions are:
1. Neutrophils | 2. Macrophages |
3. Monocytes | 4. Lymphocytes |