...abnormalities, known as heart blocks, and their...
...conduction of the heart 1. The primary...
...pacemaker of the heart is the sinoatrial...
...which controls the heart rate normally between...
...Conduction of the Heart Intrinsic electrical circuit...
...an ECG: get heart rate, observe R–R...
...B. Measure the heart rate C. Examine...
...ECG Interpretation Measure heart rate IV. Risk...
...Dysrhythmias are abnormal heart rhythms that result...
...Dysrhythmias are abnormal heart rhythms that result...
...8. Alteration in heart rate C. Hypoxemia...
...2. Decreased electrical heart activity 3. Prolonged...
...5. Increases electrical heart activity 6. Increases...
...activity 6. Increases heart rate PowerPoint Slides...
...1. Dysrhythmias Abnormal heart rhythms Normal and...
...Hyperthermia Increases electrical heart activity Increases heart...
...heart activity Increases heart rate V. Sinus...
...defined as a heart rate less than...
...3. Sinus Tachycardia Heart rate 100–150 Complications:...
...Treatment for complete heart block is the...
...period of the heart. They are indicated...
...with severe congestive heart failure, significant bradycardia,...
...second-degree or higher heart blocks, because of...
...drugs decrease the heart rate, the heart...
...heart rate, the heart rate might be...
...with the patient’s heart rhythm. It is...
...stimulus to the heart when the heart...
...heart when the heart fails to conduct...
...stimulus to the heart when necessary. b)...
...inserted during open heart surgery; electrodes are...
...surface of the heart. b) Affixed to...
...transvenously into the heart and rest on...
...used to synchronize heart depolarization in order...
...of sensing intrinsic (heart generated) electrical activity...
...events in the heart. There are three...
...the difference between heart attack and cardiac...
...can “reorganize” his heart rhythm as well...
...as stimulate the heart. (Pacemaker action is...
...stimulus to the heart Used when myocardial...
...areas of the heart. Most common are...

...For example, a heart System of tubes,...
...Agnathans) Muscular, chambered heart contracts to increase...
...away from the heart in arteries Arteries...
...blood to the heart Vertebrate Blood Vessels...
...and Mammals Four-chambered heart Two atria and...
...Amphibians and Reptiles Heart is only partially...
...divided Three chambered heart Two atria and...
...action of the heart Two phases Systole...
...Blood enters the heart Arthropod Heart -...
...the heart Arthropod Heart - Neurogenic Figure...
...contract Volume of heart decreases; pressure increases...
...Blood leaves the heart via arteries Stretched...
...apart walls of heart Volume of heart...
...heart Volume of heart increases; pressure decreases...
...is sucked into heart Cardiac ganglion neurons...
...tissue that surrounds heart Outer (parietal )...
...Outer layer of heart, continuous with visceral...
...nerves that regulate heart and coronary arteries...
...Myocardium Layer of heart muscle cells (cardiomyocytes)...
...8.18a Amphibians Three-chambered heart Two atria, one...
...Reptile Hearts Five-chambered heart Two atria and...
...relax while the heart fills with blood...
...Pacemaker Potentials Increasing heart rate Norepinephrine released...
...Pacemaker Potentials Decreasing heart rate Acetylcholine released...
...Conducting Pathways (Mammalian Heart) Electrical Signals and...
...the Cardiac Cycle Heart functions as an...
...flow through chambers Heart sounds Closing of...
...Flow Through Your Heart and Lungs Cardiac...
...HR ? SV Heart rate Rate of...
...also cause the heart to contract more...
...relationship for muscle Heart automatically compensates for...
...returning to the heart (autoregulation) Intrinsic regulation...
...Back to the Heart Blood in veins...
...back to the heart Skeletal muscle Contraction...
...blood into the heart is obstructed. How...

...Pumping of the heart moves oxygen-rich blood...
...muscular pump (the heart). The heart powers...
...(the heart). The heart powers circulation by...
...back to the heart. In arthropods and...
...cells. When the heart contracts, it pumps...
...sinuses. When the heart relaxes, it draws...
...other arthropods, the heart is an elongated...
...back toward the heart. The lower hydrostatic...
...and from the heart through a series...
...blood from the heart toward capillaries. Veins...
...blood to the heart from capillaries. An...
...outside of the heart and lungs. For...
...metabolic requirements. The heart consists of one...
...returning to the heart, and one or...
...out of the heart. A fish heart...
...heart. A fish heart has two main...
...passes through the heart once in each...
...atrium of the heart. In fish, blood...
...returning to the heart. When blood flows...
...single organ, the heart. The right side...
...side of the heart delivers oxygen-poor blood...
...side of the heart. Contraction of the...
...Contraction of the heart pumps this blood...
...have a three-chambered heart, with two atria...
...have a three-chambered heart, although the ventricle...
...side of the heart receives and pumps...
...arteries leave the heart allows blood flow...
...a powerful four-chambered heart was an essential...
...Coordinated cycles of heart contraction drive double...
...blood from the heart to the lungs...
...atrium of the heart. Next, the oxygen-rich...
...blood to the heart muscle. The next...
...side of the heart begins as capillaries...
...ventricle. The mammalian heart is located beneath...
...returning to the heart. Most of the...
...pumping, as the heart contracts, and filling,...
...filling, as the heart relaxes and its...
...of contraction or heart rate (number of...
...A typical resting heart rate is about...
...valves in the heart, each consisting of...
...are relaxing. The heart sounds we can...
...lub-dup.” The first heart sound (“lub”) is...
...valves causes a heart murmur, which may...
...are born with heart murmurs. Other murmurs...
...by infection. Most heart murmurs do not...
...originates in the heart itself. Because the...
...located outside the heart. The SA node...
...spread rapidly within heart tissue. The impulses...
...for the entire heart, it is influenced...
...nerves affect the heart rate, with one...
...slowing it down. Heart rate is a...
...adrenal glands increases heart rate. The rate...
...pressure by the heart. The elasticity (elastic...
...even when the heart relaxes. Impulses from...
...back to the heart at low velocity...
...only toward the heart. Physical laws governing...
...arteries when the heart contracts during ventricular...
...generated by the heart. Arteriole blood pressure...
...highest when the heart contracts during ventricular...
...Thus, when the heart contracts, blood enters...
...diastole, but the heart contracts again before...
...into arterioles, the heart contracts again, maintaining...
...blood from the heart to the brain....
...level of the heart, thus reducing the...
...pressure near the heart of over 250...
...action of the heart. The resistance of...
...by the pumping heart. Rhythmic contractions of...
...flows toward the heart. In addition, inhalation...
...veins near the heart to expand and...
...runners may risk heart failure if they...
...return to the heart is reduced when...
...stops. If the heart continues to beat...
...in the brain, heart, kidneys, and liver...
...fluid toward the heart. Disruptions in the...
...diseases—diseases of the heart and blood vessels....
...the threat of heart attack or stroke...
...part of the heart is not receiving...
...especially when the heart is laboring because...
...emotional stress. A heart attack, also called...
...because the beating heart cannot survive without...
...Even if the heart stops breathing, the...
...damaged brain tissue. Heart attacks and strokes...
...the frequency of heart attacks. Inflammation plays...
...the risk of heart attack and stroke....
...proven contributor to heart attack and stroke....
...returned to the heart and pumped to...
...high percentage), the heart would need to...
...or downward. Their heart rate and O2...

...membrane potential of heart cells (myocytes) is...
...that affect the heart g Other targets...
...Other targets for heart drugs Drugs and...
...that affect the heart H Toxicants that...
...that affect the heart ...

...Training Benefit the Heart?Cardiorespiratory endurance training enhances...
...ability of the heart and lungs to...
...to the muscles.The heart becomes stronger, breathing...
...Training Benefit the Heart?The accepted measure of...
...max). As the heart muscle becomes stronger,...
...cardiac output increases.The heart’s stroke volume also...
...increases, i.e. the heart pumps more blood...
...breathes easily and heart beats faster than...