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Anatomy & Physiology: Heart Anatomy and Cardiovascular System

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Termini in questo insieme (20)

  • What are the key cellular features of cardiac muscle cells?
    Cardiac muscle cells are short and branched, possess sarcomeres, have more mitochondria, less Ca2+, contain intercalated disks, and exhibit automaticity and autorhythmicity.
  • Name the three layers of the heart wall.
    The three layers are the epicardium, myocardium, and endocardium.
  • What structures make up the pericardium?
    The pericardium consists of the parietal and visceral layers, with the pericardial cavity containing pericardial fluid between them.
  • What are the main circuits of the circulatory system?
    The main circuits are the pulmonary circuit, systemic circuit, and coronary circulation.
  • What are the primary types of blood vessels in the circulatory system?
    The primary types are arteries, veins, and capillaries.
  • What are the four chambers of the heart?
    The heart has two atria (right and left) and two ventricles (right and left).
  • What is the function of the interatrial septum?
    The interatrial septum separates the right and left atria and contains the fossa ovalis, a remnant of the fetal foramen ovale.
  • What separates the ventricles of the heart?
    The interventricular septum separates the right and left ventricles.
  • What are the atrioventricular (AV) valves and their function?
    The AV valves (tricuspid on the right, bicuspid/mitral on the left) prevent backflow of blood from ventricles to atria during ventricular contraction.
  • Name the major veins entering the right atrium.
    The superior vena cava, inferior vena cava, and coronary sinus enter the right atrium.
  • What valve controls blood flow from the right atrium to the right ventricle?
    The right AV valve, also called the tricuspid valve, controls this flow.
  • Which valve leads blood from the right ventricle to the pulmonary trunk?
    The pulmonary (semilunar) valve controls blood flow into the pulmonary trunk.
  • Which veins bring oxygenated blood to the left atrium?
    The pulmonary veins bring oxygenated blood to the left atrium.
  • What valve controls blood flow from the left atrium to the left ventricle?
    The left AV valve, also known as the bicuspid or mitral valve, controls this flow.
  • Which valve controls blood flow from the left ventricle to the aorta?
    The aortic (semilunar) valve controls blood flow into the ascending aorta.
  • Name the major arteries branching from the aorta relevant to the heart.
    The coronary arteries branch from the ascending aorta; the aorta also has an arch and a descending portion.
  • What is the ductus arteriosus and its adult remnant?
    The ductus arteriosus is a fetal blood vessel connecting the pulmonary trunk to the aorta; it becomes the ligamentum arteriosum after birth.
  • What is the role of intercalated disks in cardiac muscle?
    Intercalated disks connect cardiac muscle cells, allowing rapid electrical signal transmission and synchronized contraction.
  • What does automaticity in cardiac cells mean?
    Automaticity is the ability of cardiac cells to generate their own electrical impulses without external stimuli.
  • What is the significance of more mitochondria in cardiac muscle cells?
    More mitochondria provide the energy needed for continuous, rhythmic contractions of the heart muscle.