Short Answer

Left ventricle is thick than all other chambers of heart.

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1. The left ventricle propels oxygenated blood throughout the body, creating higher pressure within its chamber. 2. In contrast, the right ventricle pumps deoxygenated blood to the lungs without exerting significant pressure, given the proximity of the lungs to the heart. 3. Reflecting these distinct functions, the left ventricle features a thicker wall compared to … Read more

Arteries are thicker than veins.

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1. The circulatory system comprises the heart and blood vessels, categorized into arteries, veins, and capillaries.

2. Arteries, with their thick and elastic walls, bear the pressure exerted by the blood propelled forcefully during ventricular systole.

3. The heart pumps blood at high pressure into the aorta and its branches to supply oxygen and nutrients to both the brain and areas below the heart.

4. Veins play a crucial role in returning deoxygenated blood back to the heart for reoxygenation.

5. Capillaries, the smallest vessels, facilitate the exchange of nutrients and waste products between blood and surrounding tissues.

6. The arterial system’s resilience ensures efficient blood circulation, supporting vital functions throughout the body.

Person who has undergone heart transplant needs lifetime supply of immunosupressants.

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1. Closed circulation, with its high blood pressure in vessels, enables efficient and swift blood flow to distant body parts. 2. Open circulation, lacking arteries and vessels, results in lower blood pressure, causing a slower delivery of blood to body cells, making closed circulation more efficient.

Human heart is called as myogenic and autorhythmic.

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1. The heart exhibits auto-rhythmicity as the impulse for its rhythmic contractions originates internally, a characteristic known as myogenicity. 2. Certain cardiac muscle fibers acquire self-excitability during development, contributing to the generation of impulses. 3. These self-excitable fibers serve crucial roles as pacemakers, establishing the heart’s rhythm. 4. Additionally, they constitute a conductive system facilitating … Read more

Closed circulation is more efficient than open circulation.

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1. Closed circulation significantly boosts the speed, precision, and efficiency of blood flow, allowing for faster circulation through the closed system and quicker return to the heart. 2. In open circulation, lacking dedicated blood vessels like arteries or veins, there is a resulting low blood pressure, contrasting with the heightened efficiency of closed circulation.

Explain in brief the factors affecting blood pressure.

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1. Cardiac Output: A typical cardiac output is 5 liters per minute. Elevated cardiac output correlates with an increase in systolic pressure. 2. Peripheral Resistance: The resistance in peripheral vessels hinges on their diameter. Vasoconstriction induced by vasopressin results in heightened peripheral resistance, leading to an elevation in blood pressure. 3. Blood Volume: Traumatic blood … Read more

What is role of papillary muscles and chordae tendinae in human heart?

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Papillary muscles form prominent ridges in ventricles. Bicuspid and tricuspid valves connect to these muscles via chordae tendinae. Chordae tendinae are inelastic fibers within ventricles. They prevent valve reversal into atria during ventricular contraction, controlling valve opening and closing. The intricate system ensures proper heart function.

Describe valves of human heart.

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1. Tricuspid Valve: – Location: Junction of right atrium and right ventricle. – Function: Opens for blood flow from right atrium to right ventricle. 2. Pulmonary Valve: – Location: Right ventricle and pulmonary artery. – Function: Opens for blood flow from right ventricle to lungs. 3. Bicuspid Valve (Mitral Valve): – Location: Left atrium. – … Read more

Describe pericardium.

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1. The heart is positioned on the left side of the chest within a fluid-filled space called the pericardial cavity. 2. This cavity is enveloped by a protective membrane known as the pericardium. 3. The pericardium, a fibrous membrane, serves as an external covering for the heart. 4. Its primary function is to safeguard the … Read more

Explain blood clotting in short.

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Blood clotting, also known as coagulation, is a crucial mechanism that prevents excessive bleeding when a blood vessel is damaged. Platelets, a type of blood cell, collaborate with proteins in the plasma (the liquid component of blood) to form a clot, effectively halting the bleeding at the site of injury. The process of blood clotting … Read more