Cardiovascular Anatomy and Physiology Quiz

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Questions and Answers

What is the correct sequence of events in one cardiac cycle?

Isovolumic contraction, Ventricular filling, Diastole

Isovolumic relaxation, Atrial systole, Ejection

Atrial systole, Isovolumic contraction, Ejection (correct)

Atrial systole, Ejection, Isovolumic relaxation

Which artery is NOT a branch of the left coronary artery?

Left anterior descending artery

Both A and B

Right marginal branch (correct)

Circumflex artery

In the context of the cardiovascular system, which formula correctly describes flow?

Flow (I) = P × R

Flow (I) = R × P

Flow (I) = P / R (correct)

Flow (I) = R / P

Which phase of the cardiac cycle follows isovolumic contraction?

Ejection Signup and view all the answers

What is the relationship between resistance and the radius of a vessel?

Resistance is inversely proportional to the fourth power of the radius Signup and view all the answers

What is the relationship between blood pressure, cardiac output, and peripheral vascular resistance?

Blood pressure increases with increased cardiac output and resistance Signup and view all the answers

Which hormone is primarily secreted when the atrium or ventricle is stretched due to increased blood volume?

Natriuretic peptides Signup and view all the answers

Which condition is primarily characterized by low cardiac output and decreased ejection fraction?

Forward heart failure Signup and view all the answers

How does angiotensin II affect blood pressure?

It stimulates secretion of aldosterone and causes vasoconstriction Signup and view all the answers

What is true about diastolic dysfunction?

It leads to an increased left ventricular end-diastolic pressure Signup and view all the answers

Which of the following triggers the secretion of renin?

Decreased stretch due to volume depletion Signup and view all the answers

What is the main physiological change associated with increased afterload?

Decreased left ventricular ejection fraction Signup and view all the answers

Which of the following factors does NOT typically lead to cardiovascular disease?

Increased physical activity Signup and view all the answers

What is the effect of sympathetic activity on heart parameters?

Increased heart rate and contractility Signup and view all the answers

How does aldosterone influence renal function?

It stimulates sodium reabsorption Signup and view all the answers

Study Notes

Cardiac Anatomy

Heart consists of multi-chambers and functions as a dual cycle electrical pump.
Key coronary vessels:
- Right coronary artery includes conus, right marginal branch, and posterior descending branch.
- Left coronary artery comprises the left anterior descending and circumflex arteries.
- Coronary capillaries facilitate nutrient exchange.
- Coronary veins include the coronary sinus, great cardiac vein, and posterior vein of the left ventricle.

Cardiac Cycle

Represents the sequence of events in one heartbeat, including:
- Diastole: heart relaxation phase.
- Systole: heart contraction phase.
Phases of cardiac cycle:
- Atrial systole,
- Isovolumic contraction,
- Ejection,
- Isovolumic relaxation,
- Ventricular filling.

Electrical Circuit and Ion Concentrations

Sodium and potassium ion concentrations are crucial:
- Sodium [Na+] = 140 mEq/L, [Na+] inside cell = 10 mEq/L.
- Potassium [K+] = 4.0 mEq/L, [K+] inside cell = 120 mEq/L.
Electrochemical gradients contribute to action potential generation.

Excitation-Contraction Coupling

Excitation-contraction coupling involves steps leading to muscle contraction in cardiomyocytes, the heart's muscle cells.

Cardiac Output and Regulation

Cardiac output (CO) calculated as CO = Stroke Volume (SV) x Heart Rate (HR), measured in liters/minute.
Factors influencing blood pressure include cardiac output (BP = CO x Peripheral Vascular Resistance).
Resistance in the cardiovascular system is determined by the formula:
- Resistance = 8ηL / πr^4, with r being the radius, L as the length, and η denoting viscosity.

Blood Pressure Regulation

Normal blood pressure is regulated by monitoring cardiac output and peripheral vascular resistance.
Sympathetic activity boosts heart rate and contractility while promoting vasoconstriction.
Hormonal influences from substances like epinephrine and natriuretic peptides also modulate blood pressure.

Heart Failure

Types of heart failure include:
- Systolic dysfunction characterized by low cardiac output and decreased ejection fraction.
- Diastolic dysfunction with preserved ejection fraction but increased left ventricular end-diastolic pressure (LVEDP).
Common etiologies encompass hypertension, ischemic injury, valvular disease, genetic factors, and myocarditis (viral or autoimmune).

Atherosclerosis and Coronary Artery Disease (CAD)

Atherosclerosis is a specific form of arteriosclerosis, defined by:
- Thickening and hardening of arterial walls due to lipid-laden macrophages.
- Involves plaque development through inflammation, cellular proliferation, and oxidized LDL formation.
Coronary artery disease refers to vascular disorders narrowing or occluding coronary arteries, typically stemming from atherosclerosis.
Risk factors for CAD include dyslipidemia, hypertension, smoking, diabetes, obesity/sedentary lifestyle, and chronic kidney disease.

Myocardial Remodeling and Baroreceptor Activity

Myocardial remodeling can manifest as hypertrophy, atrophy, or apoptosis due to nutrient/oxygen delivery fluctuations.
Baroreceptors respond to changes in blood flow and pressure, leading to adjustments in renal sympathetic activity and sodium retention.

Integrated Function

The relationship between flow (I), pressure (P), and resistance (R) encapsulates cardiovascular dynamics, emphasizing the importance of these elements in maintaining physiological homeostasis.

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Description

Test your knowledge on the anatomy and physiology of the cardiovascular system. This quiz covers the structure and function of the heart, coronary vessels, and related components. It is an excellent resource for anyone studying cardiovascular health or medicine.