physiology chapter 9 cardiac

physiology chapter 9 cardiac - Chapter 9 Cardiac Physiology...

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Chapter 9 Cardiac Physiology
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Circulatory System Terminology Three basic components 1. ________ Serves as pump that establishes the pressure gradient needed for blood to flow to tissues 2. ________ Passageways through which blood is distributed from heart to all parts of body and back to heart 3. ________ Transport medium within which materials being transported are dissolved or suspended
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Circulatory System _________ circulation Closed loop of vessels carrying blood between heart and lungs _________ circulation Circuit of vessels carrying blood between heart and other body systems
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Circulatory System, cont. Anatomy of the heart Hollow, muscular organ about the size of a clenched fist Positioned between two bony structures – sternum and vertebrae Position makes it physically possible to manually drive blood from heart when it is not pumping effectively (CPR)
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Circulatory System Terminology Heart Arteries Carry blood away from ventricles to tissues Veins Vessels that return blood from tissues to the atria Dual pump Right and left sides of heart function as two separate pumps Right side part of _______________ circulation Left side part of _______________ circulation Divided into right and left halves and has four chambers Atria Upper chambers Receive blood returning to heart and transfer it to the __________ Ventricles Lower chambers which pump blood from heart to where?
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Circuit of Blood Flow Venae cavae veins returning blood to the right atrium (from where?) Oxygen has been extracted from this blood (where and why?) Carbon dioxide has been added to it (where and why?) Right atrium Right _____ (via right _________ valve) pulmonary trunk capillary beds of lungs (what happens there?) Capillary beds of lungs _____ veins left ______ left _______ aorta. Blood goes where next and why? Direction of blood flow through the heart (animation): *
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Quiz yourself!
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Question 1 You are a drop of blood in the right ventricle. To which structure will you flow next?
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Question 2 The structure indicated by the bracket will do which of the following during muscle contraction: shorten , lengthen , or stay the same width ?
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Question 3 This body builder exhibits an increased in skeletal muscle mass called muscle ______________.
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Question 4 In the image below (a close-up of skeletal muscle contractile elements), the fuscia (pink) spheres (3) represent _______________.
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Question 5 The increased force of contraction indicated by the “star” is called twitch ___________.
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Blood Flow Through and Pump Action of the Heart
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Comparison of right and left pumps (ventricles) Both sides of heart pump equal amounts of blood __________ circulation Low pressure Pressure = force placed on vessel walls Low resistance Resistance = opposition to flow __________ circulation High pressure High resistance
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