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- https://bio.libretexts.org/Courses/Skyline_College/BIOL_130%3A_Human_Biology/11%3A_Cardiovascular_System/11.03%3A_HeartThe heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump b...The heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump blood through blood vessels of the cardiovascular system. The continuous flow of blood through the system is necessary to provide all the cells of the body with oxygen and nutrients and to remove their metabolic wastes.
- https://bio.libretexts.org/Courses/Canada_College/Human_Biology_Biol_011_Textbook/15%3A_Cardiovascular_System/15.03%3A_HeartThe heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump b...The heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump blood through blood vessels of the cardiovascular system. The continuous flow of blood through the system is necessary to provide all the cells of the body with oxygen and nutrients and to remove their metabolic wastes.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/15%3A_The_Anatomy_and_Physiology_of_Animals/15.03%3A_Circulatory_Systems/15.3K%3A_Animal_Circulatory_SystemsThis page outlines the components and challenges of efficient circulatory systems, highlighting the differences across species. It notes that fish have less efficient systems due to pressure loss in g...This page outlines the components and challenges of efficient circulatory systems, highlighting the differences across species. It notes that fish have less efficient systems due to pressure loss in gills, while squids use separate pumps. Amphibians possess three-chambered hearts with some blood mixing, whereas lizards have a muscular septum to enhance separation.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/15%3A_The_Anatomy_and_Physiology_of_Animals/15.03%3A_Circulatory_Systems/15.3C%3A_The_HeartbeatThis page explains the human heart's function, including its average heartbeat of 70 times per minute and pumping of 5 liters of blood. The sino-atrial node serves as the pacemaker, with contractions ...This page explains the human heart's function, including its average heartbeat of 70 times per minute and pumping of 5 liters of blood. The sino-atrial node serves as the pacemaker, with contractions detected by electrocardiograms (ECGs). It highlights ventricular fibrillation, which can be treated with defibrillators. Additionally, the heart rate is adjusted by the accelerans and vagus nerves, responding to stress and bodily needs to regulate heartbeat and blood pressure.
- https://bio.libretexts.org/Courses/Minnesota_State_Community_and_Technical_College/Biology_of_Human_Concerns_(Daniels)/05%3A_Cardiovascular_System/5.03%3A_HeartThe heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump b...The heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump blood through blood vessels of the cardiovascular system. The continuous flow of blood through the system is necessary to provide all the cells of the body with oxygen and nutrients and to remove their metabolic wastes.
- https://bio.libretexts.org/Courses/Butte_College/BC%3A_BIOL_2_-_Introduction_to_Human_Biology_(Grewal)/Text/17%3A_Cardiovascular_System/17.3%3A_HeartThe heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump b...The heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump blood through blood vessels of the cardiovascular system. The continuous flow of blood through the system is necessary to provide all the cells of the body with oxygen and nutrients and to remove their metabolic wastes.
- https://bio.libretexts.org/Workbench/Principles_of_the_Human_Body/17%3A_Cardiovascular_System/17.3%3A_HeartThe heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump b...The heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump blood through blood vessels of the cardiovascular system. The continuous flow of blood through the system is necessary to provide all the cells of the body with oxygen and nutrients and to remove their metabolic wastes.
- https://bio.libretexts.org/Courses/Cosumnes_River_College/Introductory_Anatomy_and_Physiology_(Aptekar)/10%3A_Cardiovascular_System-_Heart_and_Blood_Vessels/10.03%3A_HeartThe heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump b...The heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump blood through blood vessels of the cardiovascular system. The continuous flow of blood through the system is necessary to provide all the cells of the body with oxygen and nutrients and to remove their metabolic wastes.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/15%3A_The_Anatomy_and_Physiology_of_Animals/15.03%3A_Circulatory_Systems/15.3A%3A_Anatomy_of_Human_Circulatory_SystemThis page describes the circulatory system's role in transporting blood and essential substances, supporting functions like nourishment, temperature regulation, and homeostasis. It includes the heart,...This page describes the circulatory system's role in transporting blood and essential substances, supporting functions like nourishment, temperature regulation, and homeostasis. It includes the heart, blood vessels, and organs for material exchange. The coronary system supplies blood to the heart, which can be affected by conditions such as arteriosclerosis and atherosclerosis, leading to heart disease and heart attacks. Systemic circulation delivers blood throughout the body.
- https://bio.libretexts.org/Courses/Community_College_of_Vermont/Human_Biology_(Gabor_Gyurkovics)/07%3A_Cardiovascular_System/7.03%3A_HeartThe heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump b...The heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump blood through blood vessels of the cardiovascular system. The continuous flow of blood through the system is necessary to provide all the cells of the body with oxygen and nutrients and to remove their metabolic wastes.
- https://bio.libretexts.org/Courses/Manchester_Community_College_(MCC)/BIOL_106%3A_Essentials_of_Anatomy_and_Physiology_(Anzalone)/09%3A_Blood_and_The_Cardiovascular_System/9.03%3A_HeartThe heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump b...The heart is a muscular organ behind the sternum (breastbone), slightly to the left of the center of the chest. A normal adult heart is about the size of a fist. The function of the heart is to pump blood through blood vessels of the cardiovascular system. The continuous flow of blood through the system is necessary to provide all the cells of the body with oxygen and nutrients and to remove their metabolic wastes.
