BIOS 2400 Lecture Notes - Lecture 13: Superior Vena Cava, Pulmonary Valve, Pulmonary Artery
13 Mar 2017
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Bios 2400 - chapter 13 - blood, heart, and circulation. Issues in pregnancy - an rh mother exposed to rh+ fetal blood produces antibodies. This may cause erythroblastosis fetalis in future pregnancies as antibodies cross the placenta and attack fetal rbcs. Cardiac autorhythmic cells: threshold potential is at -40mv; no true resting potential b/c ap are continuous, k+ closes at -60mv, transient ca2+ opens. 40mv, voltage-gated long lasting ca2+ open: ca2+ rushes in then at 0-10mv, k+ open and goes out and repolarization occurs, slow depolarization (pacemaker potential) results in no summation or tetanus. Characteristics of autorhythmic (pacemaker) cells: unstable membrane potential. Increased: heart rate, contractility, and conduction of action potentials: no increase in voltage just frequency, altering activity of pacemaker cells (parasympathetic activity, ach binds to muscarinic receptors. Chapter quiz questions and answers: anemia is the condition of a decreased ability to carry oxygen. Rh+ blood: john has blood type b.
