Comparing structures of the heart

Your heart pumps about liters of blood in your body. This may not be the complete list of references from this article. They are connected to large arteries that carry blood to the circulation.

It arises from the lower part of the interventricular septum and crosses the interior space of the right ventricle to connect with the inferior papillary muscle. Almost at the same time, blood from the left atrium, which has come from the lungs, empties into the left ventricle, through the open mitral valve.

Physical Appearance and Major Components of the Heart The heart is a muscular cone-shaped organ about the size of a clenched fist of the same person. The difference in size is related Comparing structures of the heart their functions.

Ventriculoatrial conduction in swine during cardiac pacing: Correlation of hemodynamic performance and metabolism in the working swine heart. The outer layer is composed of relatively inelastic connective tissue and is termed the parietal layer. The left circumflex supplies the back and underneath of the left ventricle.

There is an aortic valve between the left ventricle and the aorta and a pulmonary valve between the right ventricle and the pulmonary artery. Deoxygenated blood leaves the right ventricle by pulmonary arterywhich takes blood to the lungs via the right and left brances of the pulmonary artery.

Transport blood away from the heart Transport oxygenated blood only except in the case of the pulmonary artery. Architecture of atrial musculature in humans. The heart wall is made up of three layers: The left anterior descending artery supplies heart tissue and the front, outer side, and the septum of the left ventricle.

Analogous structures - structures similar in different organisms because, in convergent evolutionthey evolved in a similar environment, rather than were inherited from a recent common ancestor. The following diagram summarises the structural differences between different types of blood vessels.

The fibrous skeleton is composed of dense connective tissue rings that surround the four heart orifices. The Pericardium This is a fibrous covering that wraps around the heart and holds it in place. The pulmonary valve lies between the right heart and the pulmonary trunk.

Consequently, the left ventricle works harder than the right ventricle to maintain the same blood flow rate. Although cardiac muscle fibres branch and interconnect with each other, they form two separate functional syncytia, one for the atria and another for the ventricles. It is also known as the bicuspid valve due to its having two cusps, an anterior and a posterior cusp.

This distinction is visible also on the surface of the heart as the coronary sulcus. The left ventricle pumps blood to the body through the aortic valve and into the aorta.

The QRS electrocardiogram, epicardiogram, vectorcardiogram and ventricular excitation of swine.

Anatomy of the pig heart: comparisons with normal human cardiac structure

The main purpose of the heart is to pump blood around the body. The porcine left atrium received only 2 pulmonary veins, whereas 4 orifices were generally observed in man.

A quantitative study of the anatomy and distribution of coronary arteries in swine in comparison with other animals and man.

The porcine superior and inferior caval veins opened into the atrium at right angles to one another, whereas in man the orifices were directly in line. Instead, they were based on animals such as oxen. The mitral also known as the bicuspid valve separates the left atrium from the left ventricle.

Similarly, the left atrium and the left ventricle together are sometimes referred to as the left heart.

In addition to these muscular ridges, a band of cardiac muscle, also covered by endocardium, known as the moderator band reinforces the thin walls of the right ventricle and plays a crucial role in cardiac conduction. Evidence of common descent Comparative anatomy has long served as evidence for evolutionnow joined in that role by comparative genomics ; [6] it indicates that organisms share a common ancestor.

Veins The walls outer structure of veins consist of three layers of tissues that are thinner and less elastic than the corresponding layers of arteries. The fat-filled coronary groove contains the coronary blood vessels and marks the separation of the atria and ventricles.

The tricuspid valve separates the right atrium from the right ventricle. A common example of comparative anatomy is the similar bone structures in forelimbs of cats, whales, bats, and humans. Right Ventricle The right ventricle forms most of the anterior surface of the heart and is crescent-shaped in cross-section.Structure of the Heart.

The human heart is a four-chambered muscular organ, shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline. Comparing Structures of the Heart. Print Reference this. Disclaimer: The endocardium is the epithelial lining of the inside of the heart and includes all the structures internally.

The endocardium also has an endocrine function, secreting endocardin which helps to sustain contraction. Infarctions can involve the endocardium and previously. Comparative anatomy is the study of similarities and differences in the anatomy of different species. An interesting observation made by some of these physicians was the presence of homologous structures in a wide variety of animals which included humans.

Start studying heart structure 3. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Know the Structures and Functions about Your Heart. Knowledge of your heart structure and its function will help you appreciate how this important organ works to pump blood to the whole body.

Although it is barely the size of a human fist, the heart is a powerful muscle inside the chest, with a cone shape and a pointed end facing the left.

The human heart, in contrast, was trapezoidal in silhouette, reflecting man's orthograde posture.

Know the Structures and Functions about Your Heart

The morphologically right atrium of the pig was characterised by the tubular shape of its appendage (a feature observed on the left in the human heart).

Comparing structures of the heart
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