Untitled Flashcards Set

Aorta

The largest and most elastic artery in the body, originating from the left ventricle of the heart.

Function of the Aorta

Carries oxygen-rich blood from the heart throughout the body.

Superior Vena Cava

A vein that receives deoxygenated blood from the upper body and transports it to the right atrium.

Inferior Vena Cava

A long vein that receives deoxygenated blood from the lower body and transports it to the right atrium.

Difference between Superior and Inferior Vena Cava

Superior vena cava collects blood from regions above the heart; inferior vena cava collects blood from regions below.

Pulmonary Artery

Carries deoxygenated blood from the right ventricle to the lungs for oxygenation.

Pulmonary Trunk

The sole arterial output from the right ventricle that bifurcates into right and left pulmonary arteries.

Functions of Pulmonary Veins

Transport oxygen-rich blood from the lungs back to the left atrium of the heart.

Coronary Arteries

Branch off from the ascending aorta to supply oxygen-rich blood directly to the heart muscle.

Branches of the Aortic Arch

Brachiocephalic artery, left subclavian artery, left common carotid artery.

Brachiocephalic Artery Divisions

Divides into the right subclavian artery and right common carotid artery.

Subclavian Arteries

Supply blood to the upper limbs, neck, and thorax.

Carotid Arteries

Deliver oxygen-rich blood to the brain, face, scalp, and structures in the head and neck.

Purpose of Sending Deoxygenated Blood to the Lungs

To exchange carbon dioxide for oxygen during respiration.

Separate Pathways for Oxygenated and Deoxygenated Blood

Ensure efficient gas exchange and prevent mixing of blood types.

Plural form of Vena Cava

Venae cavae.

Significance of Pulmonary Veins connection to Left Atrium

Ensures freshly oxygenated blood enters systemic circulation directly.

Path of Blood Flow through the Heart

Oxygen-poor blood → right atrium → tricuspid valve → right ventricle → pulmonary valve → pulmonary trunk → lungs → oxygen-rich pulmonary veins → left atrium → mitral valve → left ventricle → aortic valve → aorta → body.

Entry of Oxygen-poor Blood into the Heart

Through the superior and inferior vena cava into the right atrium.

Route after Leaving the Right Ventricle

Pumped through the pulmonary valve into the pulmonary artery to the lungs.

Blood in the Lungs

Releases carbon dioxide and picks up oxygen, becoming oxygen-rich.

Return of Oxygen-rich Blood from Lungs

Via the pulmonary veins to the left atrium.

Path of Oxygen-rich Blood after Leaving the Left Ventricle

Pumped through the aortic valve into the aorta for body distribution.

Unidirectional Blood Flow in the Heart

Prevents backflow via valves, ensuring efficient circulation.

Difference in Wall Thickness between Ventricles

Left ventricle has thicker walls for systemic circulation; right ventricle is thinner for pulmonary circulation.

Pressure Gradient Influence on Blood Flow

Drives blood flow through valves and chambers based on contraction and relaxation.

Malfunctioning Mitral Valve Effect on Systemic Circulation

Could cause backflow into the left atrium, reducing output and oxygen delivery.

Equal Thickness of Ventricular Walls Impact

Could lead to inefficient circulation and energy expenditure.

Importance of Valves like Tricuspid and Mitral

Prevent backflow to maintain effective filling and emptying of heart chambers.

Double Pump Function of the Heart

Has two circuits: pulmonary (to lungs) and systemic (to body tissues).

Pulmonary Circulation

Pathway where deoxygenated blood is pumped from the right heart to the lungs and back for oxygenation.

Systemic Circulation

Pathway where oxygenated blood is pumped from the left heart to body tissues and returns deoxygenated blood.

Single Pump Limitation

Inability to maintain pressure for both circuits; high pressure would damage lungs, low pressure would be insufficient for systemic needs.

Failure in One Circulation Circuit Effects

Pulmonary failure prevents oxygenation; systemic failure leads to inadequate oxygen and nutrient delivery.

Significance of Simultaneous Circulation

Ensures continuous blood oxygenation and delivery of nutrients to maintain metabolic balance.