5 Written questions
5 Matching questions
- End-systolic volume
- Period of isovolumetric relaxation
- Calcium-induced calcium release (CICR)
- a The volume is decreased to 50-60 mL.
- b blood begins to flow back toward the ventricles, causing the semilunar valves to close. With closure of the semilunar valves, all the heart valves are closed, and no blood flows into the relaxing ventricle during this period.
- c is the medical specialty concerned with diagnosing and treating heart disease.
- d 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.
- e Specialized plasma membrane structures hold the cells together.
5 Multiple choice questions
- Separates the 2 atria
- results from the heart's normal functional characteristics and does not depend on either neural or hormonal regulation.
- 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 semilunar valves are pushed open, and blood flows from the ventricles into the pulmonary trunk and aorta.
- Slows and strengthens contractions of the heart muscle by increasing the amount of Ca2+ that enters cardiac muscle cells and by prolonging the action potentials' refractory period.
5 True/False questions
Fibrous Pericardium → a tough, fibrous connective tissue outer layer.
Voltage-gated Ca2+ channels → membrane channels open, bringing about the depolarization phase of the action potential.
Serous Pericardium → A thin, transparent, inner layer of simple squamous epithelium.
QRS complex → is composed of 3 individual waves: Q, R, and S waves. It results from ventricular depolarization and signals the onset of ventricular contraction.
Cervical and Upper thoracic sympathetic chain ganglia → As contraction proceeds, ventricular pressures continue to rise, but no blood flows from the ventricles because all the valves are closed. because the volume of the blood in the ventricles doesn't change, even though the ventricles are contracting.