Question

Label the internal anatomy of the sheep heart.

Answer 1

This response provides a detailed explanation of the internal anatomy of the sheep heart, including the chambers, valves, and major blood vessels. It also describes the tissue layers of the heart and their functions. The response presents the information in a clear and organized manner, making it easier for the student to understand.

Step-by-step explanation:

1. Right Atrium: Receives deoxygenated blood from the body through the superior and inferior vena cava.
2. Fossa Ovalis: A remnant of the fetal foramen ovale, which allows blood to bypass the non-functioning fetal lungs.
3. Tricuspid Valve: Separates the right atrium from the right ventricle, preventing backflow of blood.
4. Right Ventricle: Pumps deoxygenated blood to the lungs through the pulmonary artery.
5. Chordae Tendineae: Anchor the tricuspid valve cusps to the papillary muscles, preventing valve prolapse.
6. Trabeculae Carneae: Muscular ridges on the internal surface of the ventricles that help to maintain the shape and contractility of the heart.
7. Moderator Band: A specialized muscle bundle that carries part of the electrical signal for contraction to the anterior papillary muscle.
8. Inferior Vena Cava: Returns deoxygenated blood from the lower body to the right atrium.
9. Aortic Valve: Separates the left ventricle from the aorta, preventing backflow of blood.
10. Pulmonary Valve: Separates the right ventricle from the pulmonary artery, preventing backflow of blood.
11. Left Ventricle: Pumps oxygenated blood to the body through the aorta.
12. Papillary Muscle: Attached to the chordae tendineae and aid in the opening and closing of the heart valves.
13. Interventricular Septum: Thick wall that separates the right and left ventricles.
14. Epicardium: The outermost layer of the heart, composed of connective tissue that protects and anchors the heart.
15. Myocardium: The middle, muscular layer of the heart responsible for the contraction of the heart.
16. Endocardium: The innermost layer of the heart, composed of a thin layer of endothelial cells that line the chambers and valves of the heart.