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  2. Cardiac physiology - Wikipedia

    en.wikipedia.org/wiki/Cardiac_physiology

    The resting heart rate of a newborn can be 120 beats per minute (bpm) and this gradually decreases until maturity and then gradually increases again with age. The adult resting heart rate ranges from 60 to 100 bpm. Exercise and fitness levels, age and basal metabolic rate can all affect the heart rate. An athlete's heart rate can be lower than ...

  3. Heart - Wikipedia

    en.wikipedia.org/wiki/Heart

    The heart is a muscular organ found in humans and other animals. This organ pumps blood through the blood vessels. [1] Heart and blood vessels together make the circulatory system. [2] The pumped blood carries oxygen and nutrients to the tissue, while carrying metabolic waste such as carbon dioxide to the lungs. [3]

  4. Coronary circulation - Wikipedia

    en.wikipedia.org/wiki/Coronary_circulation

    Failure of oxygen delivery caused by a decrease in blood flow in front of increased oxygen demand of the heart results in tissue ischemia, a condition of oxygen deficiency. Brief ischemia is associated with intense chest pain, known as angina. Severe ischemia can cause the heart muscle to die from hypoxia, such as during a myocardial infarction ...

  5. What Is Heart Disease? Everything You Need to Know - AOL

    www.aol.com/heart-disease-everything-know...

    Heart disease is a type of cardiovascular disease that affects the heart’s structure and function. ... When your heart muscle is suddenly deprived of oxygen because a plaque on one of the blood ...

  6. Effects of high altitude on humans - Wikipedia

    en.wikipedia.org/wiki/Effects_of_high_altitude...

    At high altitude, in the short term, the lack of oxygen is sensed by the carotid bodies, which causes an increase in the breathing depth and rate . However, hyperpnea also causes the adverse effect of respiratory alkalosis, inhibiting the respiratory center from enhancing the respiratory rate as much as would be required. Inability to increase ...

  7. Which fruit is best for the heart? Cardiologists share 5 ...

    www.aol.com/news/fruit-best-heart-cardiologists...

    The vibrant color of fruits signals they’re loaded with antioxidants like vitamin C, which circulate in the body and correct all the damage people accumulate just by living and breathing oxygen ...

  8. Cardiovascular fitness - Wikipedia

    en.wikipedia.org/wiki/Cardiovascular_fitness

    Cardiovascular fitness is a component of physical fitness, which refers to a person's ability to deliver oxygen to the working muscles, including the heart.Cardiovascular fitness is improved by sustained physical activity (see also Endurance Training) and is affected by many physiological parameters, including cardiac output (determined by heart rate multiplied by stroke volume), vascular ...

  9. Local blood flow regulation - Wikipedia

    en.wikipedia.org/wiki/Local_blood_flow_regulation

    Both of these factors affect pH and, in turn, the balance between vasodilation versus vasoconstriction in the brain. [3] [4] So, the blood vessels found specifically in the brain respond changes in dissolved carbon dioxide levels. Coronary (heart) circulation is controlled at the local level primarily by metabolic control mechanism. More ...