Mastering A&P HW CH 18 | Questions with 100% Correct Answers | Verified | Updated

What is the function of the coronary circulation Provide a blood supply to the heart; Correct. The coronary circulation provides oxygenated blood to the heart through coronary arteries. Coronary veins return the deoxygenated from the heart to the coronary sinus on the posterior surface of the heart. The coronary sinus empties the deoxygenated blood directly into the right atrium where it joins deoxygenated from the body. What is the ligamentum arteriosum? A remnant of the ductus arteriosus; The ligamentum arteriosum is a remnant of the ductus arteriosus. The ductus arteriosus is a fetal shunt that connects the pulmonary trunk to the aorta. Which chamber of the heart exits into the pulmonary trunk? right ventricle; The right ventricle pumps deoxygenated blood through the pulmonary semilunar valve into the pulmonary trunk to be distributed to the lungs. Identify the ear like flaps that are attached to the top chambers of the heart. auricles; The auricles are flap like extensions of the atria that are observed on the external surface of the heart The first branch off the arch of the aorta is the brachiocephalic artery in both the sheep and the human. true; In both the sheep and human, the brachiocephalic artery is the first major vessel to exit the arch of the aorta. Further branching of the brachiocephalic artery and the arch of the aorta differs between a sheep and a human. The base of the heart is located at the bottom of the heart. false; The base is located at the top of the heart. It is unusual to see the largest portion of an organ at the top. Typically, the base is at the bottom of an organ, as in the lungs. Identify the most muscular chamber. left ventricle; The left ventricle is responsible for pumping blood out to the body. This requires a lot of force. The left ventricle is the most muscular in order to pump the blood with adequate force