What is the meaning of longitudinal section?
What is the meaning of longitudinal section?
Longitudinal section: A section that is cut along the long axis of a structure. Longitudinal section is the opposite of cross-section.
What is meant by LS of heart?
Identification of longitudinal section (L.S) of the human heart.
What is the structure of 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. The heart is enclosed in a pericardial sac that is lined with the parietal layers of a serous membrane.
What is inside your heart?
The heart consists of several layers of a tough muscular wall, the myocardium. A thin layer of tissue, the pericardium, covers the outside, and another layer, the endocardium, lines the inside. The heart cavity is divided down the middle into a right and a left heart, which in turn are subdivided into two chambers.
What is transverse section and longitudinal section?
Longitudinal section runs through the anterior posterior axis, whereas the transverse section goes between lateral ends. Usually, the number of possible transverse sections is higher than the number of possible longitudinal sections to be made through an organ or organism.
What is the difference between a cross section and a longitudinal section?
In a cross-sectional study you collect data from a population at a specific point in time; in a longitudinal study you repeatedly collect data from the same sample over an extended period of time.
What is apex and base of heart?
The apex (the most inferior, anterior, and lateral part as the heart lies in situ) is located on the midclavicular line, in the fifth intercostal space. It is formed by the left ventricle. The base of the heart, the posterior part, is formed by both atria, but mainly the left.
What is posterior to the heart?
Explanation: The heart is situated in the middle of the two lungs and in front of a vertebral column in a thoracic cavity. However it is located posterior(behind) to the breastbone plate i.e sternum.
What are the 4 main parts of the heart?
The heart has four chambers: two atria and two ventricles.
- The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle.
- The right ventricle pumps the oxygen-poor blood to the lungs.
- The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle.
What are the 3 heart circuits?
1: Circulatory System: The mammalian circulatory system is divided into three circuits: the systemic circuit, the pulmonary circuit, and the coronary circuit. Blood is pumped from veins of the systemic circuit into the right atrium of the heart, then into the right ventricle.
What sends blood back to the heart?
Oxygen-poor blood returns from the body to the heart through the superior vena cava (SVC) and inferior vena cava (IVC), the two main veins that bring blood back to the heart. The oxygen-poor blood enters the right atrium (RA), or the right upper chamber of the heart.
What is the longitudinal section of the human heart?
Identification of longitudinal section (L.S) of the human heart. To observe and draw a labelled sketch of L.S of human heart and write the structure. 1. The human heart has four chambers. It is made up of two auricles and two ventricles 2. The chambers are separated by interauricular and interventricular septum.
What is the right margin of the heart separated from?
It is separated from the base by the posterior part of the coronary sulcus, and is traversed obliquely by the posterior longitudinal sulcus. The right margin of the heart is long, and is formed by the right atrium above and the right ventricle below.
What is the shape of the left ventricle?
—The left ventricle is longer and more conical in shape than the right, and on transverse section its concavity presents an oval or nearly circular outline. It forms a small part of the sternocostal surface and a considerable part of the diaphragmatic surface of the heart; it also forms the apex of the heart.
What is the length of the human heart?
—The heart, in the adult, measures about 12 cm. in length, 8 to 9 cm. in breadth at the broadest part, and 6 cm. in thickness. Its weight, in the male, varies from 280 to 340 grams; in the female, from 230 to 280 grams.