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What is the primary function of the cardiovascular system?

To circulate blood throughout the body (correct)

To produce hormones

To provide sensory perception

To facilitate digestion

Which chamber of the heart is directed downward and toward the left?

Right ventricle

Left ventricle (correct)

Right atrium

Left atrium

What is the approximate weight of the adult male heart?

450 grams

600 grams

150 grams

300 grams (correct)

What type of tissue makes up the outer covering of the heart?

Fibrous connective tissue Signup and view all the answers

How many chambers does the human heart have?

Four Signup and view all the answers

What is contained within the pericardial cavity?

Pericardial fluid Signup and view all the answers

Which layer of the pericardium adheres to the heart itself?

Visceral layer Signup and view all the answers

In what part of the thoracic cavity is the heart located?

Mediastinum Signup and view all the answers

What is the primary function of veins in the circulatory system?

To return blood to the heart Signup and view all the answers

What is a characteristic of lymph compared to plasma?

Lymph is similar to plasma but lacks plasma proteins Signup and view all the answers

Which vessel drains lymph from the right arm and right side of the thorax?

Right Lymphatic Duct Signup and view all the answers

Where are lymph nodes predominantly located?

Along the length of lymph vessels Signup and view all the answers

What role does the spleen play in the lymphatic system?

It stores blood and removes aged cells Signup and view all the answers

What is the primary function of the sinoatrial (SA) node in the heart?

To initiate the electrical impulse for cardiac muscle excitation Signup and view all the answers

What are intercalated disks responsible for in cardiac muscle cells?

Connecting adjacent muscle cells Signup and view all the answers

What occurs during atrial systole?

Atria contract and blood moves into the ventricles Signup and view all the answers

What follows atrial systole in the cardiac cycle?

Atrial relaxation Signup and view all the answers

Which components are included in the conducting system of the heart?

Sinoatrial node, Internodal fibres, Atrioventricular node, His-Purkinje system Signup and view all the answers

What is the role of T tubules in cardiac muscle cells?

Provide extracellular calcium during contraction Signup and view all the answers

During which phase of the cardiac cycle does the first heart sound occur?

Isovolumetric contraction Signup and view all the answers

What is the duration of atrial systole in a cardiac cycle lasting 0.8 seconds?

0.1 seconds Signup and view all the answers

What characterizes the rapid ejection phase of ventricular systole?

Blood is ejected rapidly into the arteries Signup and view all the answers

What does the electrocardiogram (ECG) measure in the heart?

Electrical activity of the heart Signup and view all the answers

What is the duration of ventricular diastole in a cardiac cycle with a total time of 0.8 seconds?

0.5 seconds Signup and view all the answers

Which vessel closure produces the second heart sound?

Semilunar valves Signup and view all the answers

Which type of muscle fibers conduct impulses from the AV node to the ventricles?

His-Purkinje fibers Signup and view all the answers

Which phase of ventricular diastole occurs first?

Isometric relaxation phase Signup and view all the answers

What happens during the isovolumetric contraction phase?

Pressure rises within the ventricles Signup and view all the answers

The third heart sound occurs during which part of the cardiac cycle?

First rapid filling phase Signup and view all the answers

What is the primary function of arteries in the circulatory system?

To carry blood away from the heart Signup and view all the answers

Which layer is NOT part of the three-layered structure of blood vessels?

Tunica vasculosa Signup and view all the answers

Which force acts to favor filtration in the capillaries?

Hydrostatic pressure of the capillaries Signup and view all the answers

What structural feature distinguishes veins from arteries?

Valves permitting one-way flow Signup and view all the answers

What happens to the walls of arteries during systolic flow?

They expand to accommodate blood Signup and view all the answers

What are small veins that arise from the unification of capillaries called?

Venules Signup and view all the answers

Which component increases hydrostatic pressure in capillaries?

Smooth muscle contraction in venules Signup and view all the answers

How do capillaries facilitate the exchange of substances?

Via filtration and reabsorption guided by various pressures Signup and view all the answers

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Questions and Answers

What is the primary function of the cardiovascular system?

Which chamber of the heart is directed downward and toward the left?

What is the approximate weight of the adult male heart?

What type of tissue makes up the outer covering of the heart?

How many chambers does the human heart have?

What is contained within the pericardial cavity?

Which layer of the pericardium adheres to the heart itself?

In what part of the thoracic cavity is the heart located?

What is the primary function of veins in the circulatory system?

What is a characteristic of lymph compared to plasma?

Which vessel drains lymph from the right arm and right side of the thorax?

Where are lymph nodes predominantly located?

What role does the spleen play in the lymphatic system?

What is the primary function of the sinoatrial (SA) node in the heart?

What are intercalated disks responsible for in cardiac muscle cells?

What occurs during atrial systole?

What follows atrial systole in the cardiac cycle?

Which components are included in the conducting system of the heart?

What is the role of T tubules in cardiac muscle cells?

During which phase of the cardiac cycle does the first heart sound occur?

What is the duration of atrial systole in a cardiac cycle lasting 0.8 seconds?

What characterizes the rapid ejection phase of ventricular systole?

What does the electrocardiogram (ECG) measure in the heart?

What is the duration of ventricular diastole in a cardiac cycle with a total time of 0.8 seconds?

Which vessel closure produces the second heart sound?

Which type of muscle fibers conduct impulses from the AV node to the ventricles?

Which phase of ventricular diastole occurs first?

What happens during the isovolumetric contraction phase?

The third heart sound occurs during which part of the cardiac cycle?

What is the primary function of arteries in the circulatory system?

Which layer is NOT part of the three-layered structure of blood vessels?

Which force acts to favor filtration in the capillaries?

What structural feature distinguishes veins from arteries?

What happens to the walls of arteries during systolic flow?

What are small veins that arise from the unification of capillaries called?

Which component increases hydrostatic pressure in capillaries?

How do capillaries facilitate the exchange of substances?

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