5 Written questions
5 Matching questions
- Refractory periods
- Great Cardiac Vein
- Absolute refractory period
- Fibrous rings
- Purkinje fibers
- a the major vein draining the tissue on the left side of the heart.
- b The Cardiac muscle cell is completely insensitive to further stimulation. Portion of the action potential during which the membrane is insensitive to all stimuli, regardless of their strength.
- c The inferior terminal branches of the bundle branches, are large-diameter cardiac muscle fibers. Modified cardiac muscle cells found beneath the endocardium of the ventricles. Specialized to conduct action potentials.
- d is formed by the heart skeleton, which surround the atrioventricular and semilunar valves and provides solid support for them, reinforcing the valve openings.
- e Period following effective stimulation during which excitable tissue, such as heart muscle, fails to respond to a stimulus of threshold intensity.
5 Multiple choice questions
- The AV valve between the right atrium and right ventricle has 3 cusps.
- The extent to which the ventricular walls are stretched.
- detect changes in blood pressure and lead to changes in heart rate and force of contraction. Changes in blood pressure and produces changes in heart rate, heart force of contraction, and blood vessel diameter that return blood pressure to homeostatic levels.
- The movement of Ca2+ through the plasma membrane, including the membranes of the T tubules, into cardiac muscle cells stimulates the release of Ca2+ from the sarcoplasmic reticulum.
- thick-walled, form the anterior and inferior parts of the heart.
5 True/False questions
Gap junctions → Either one of the tenth pair of cranial nerves, consisting of motor fibers that innervate the muscles of the pharynx, larynx, heart, and thoracic and abdominal viscera, and of sensory fibers that conduct impulses from these structures to the brain.
Artificial Pacemaker → is an instrument, placed beneath the skin, equipped with an electrode that extends to the heart and provides an electrical stimulus at a set frequency.
Atrioventricular canal → is medial to the right atrioventricular valve. Small node of specialized cardiac muscle fibers that gives rise to the atrioventricular bundle of the conduction system of the heart.
Ectopic focus → is any part of the heart other than the SA node that generates a heartbeat.
Coronary arteries → One of the arteries that arise from the base of the aorta and carry blood to the muscle of the heart. Exit the aorta just above the point where the aorta leaves the heart and lie within the coronary sulcus