Bios 255 Exam 1; Questions & Answers Verified 100% Correct

Bios 255 Exam 1; Questions & Answers Verified 100% Correct what are 3 'systems' of blood circulation that we discussed in class? - ANSWER pulmonary system systemic system coronary system during ventricular systole, what is happening to the blood volume within the ventricle? - ANSWER -first, there is no change-once pressure is great enough and the semilunar valves one, volume drops what 3 veins empty into the right atrium - ANSWER -superior vena cava, inferior vena cava, coronary sinus an individual has an increase in afterload, what effect would this have on MAP - ANSWER -an increase in afterload=decrease in SV=decrease in CO=decrease in MAP what are two unique structures the fetus heart has and not the adult heart? - ANSWER -foramen ovale and ductus arteriosus which chamber of the heart has the thickest walls? - ANSWER -left ventricle during the cardiac cycle, the heart experiences two isovolumetric states- when do these occur? - ANSWER -the beginning of ventricular systole and beginning of ventricular diastole during ventricular systole, what happens to the pressure within the ventricles? - ANSWER -it increases where do heart sounds come from? - ANSWER -closing of valves where is the atrial repolarization located on an EKG - ANSWER -it is masked by the QRS complex what chambers are contracting to cause the p-wave on an EKG - ANSWER -the left and right atria what are the 5 structures of the cardiac conductive tissue? - ANSWER -1) SA node 2) AV node 3) bundle of his 4) left and right bundle branches 5) purkinji fibers the process of creating new red blood cells is called? - ANSWER –erythropoiesis name the structure and whether it contains oxygenated or deoxygenated blood - ANSWER -right atrium; deoxygenated name the structure - ANSWER -aortic semilunar valve oxygen is carried by _______ cells. it binds to proteins called ______ that contain iron - ANSWER -erythrocytes; hemoglobin of the formed elements, which cells are responsible for immune function, clotting, and gas transfer-in that order? - ANSWER -leukocytes, platelets, erythrocytes what are the major functions of blood? (you must name 3) - ANSWER -1) plays a role in immune function 2) temp regulation 3) pH regulation 4) gas/nutrients/ waste transport 5) regulates water loss a patient has a stroke volume of 70ml/beat, a heart rate of 70 beats/min, a mean arterial pressure of 100, systolic BP of 95 and diastolic BP of 60. calculate output of this patient - ANSWER -CO=SVxHR=70ml/beat/min=4900ml/min=4.9L/min which ions mediate the upstroke, plateau, and downstroke of a cardiac action potential. indicate the contraction phase that correlates to these events - ANSWER -upstroke=sodium; depolarization plateau=calcium; contraction downstroke=potassium; relaxation what are the three layers of the heart? - ANSWER -epicardium, myocardium, endocardium