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 |
In a normal ECG, The T wave represents:
1. | ventricular depolarization | 2. | atrial repolarization |
3. | ventricular repolarization | 4. | atrial depolarization |
The chamber with the thickest musculature in the human heart would be:
1. the right atrium | 2. the left atrium |
3. the left ventricle | 4. the right ventricle |