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Sinus node dysfunction also known as sick sinus syndrome is a group of irregular heartbeat conditions caused by faulty electrical signals of the heart. When the heart's sinoatrial node is defective, the heart's rhythms become abnormal—typically too slow or exhibiting pauses in its function or a combination, and very rarely faster than normal ...
Diagram of the female rabbit reproductive system with main components labeled. The adult female reproductive tract is bipartite, which prevents an embryo from translocating between uteri. [91] The female urethra and vagina open into a urogenital sinus with a single urogenital opening. [92]
Accelerans nerve forms a part of the sympathetic branch of the autonomic nervous system, and its function is to release noradrenaline at its endings on the heart. The heart beats according to a rhythm set up by the sinus-atrial node or pacemaker, which is located on the right atrium of the heart.
The action potential passes along the cell membrane causing the cell to contract, therefore the activity of the sinoatrial node results in a resting heart rate of roughly 60–100 beats per minute. All cardiac muscle cells are electrically linked to one another, by intercalated discs which allow the action potential to pass from one cell to the ...
English: Heart diagram with labels in English. Blue components indicate de-oxygenated blood pathways and red components indicate oxygenated blood pathways. [1] [2]
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Humans have a four-chambered heart consisting of the right and left atrium, and the right and left ventricle. The atria are the two upper chambers which pump blood to the two lower ventricles. The right atrium and ventricle are often referred to together as the right heart, and the left atrium and ventricle as the left heart.
Oryctolagus (/ ˌ ɔː r ɪ k ˈ t ɑː l ə ɡ ə s /) is a genus of lagomorph that today contains the European rabbit and its descendant, the domestic rabbit, as well as several fossil species. The generic name derives from Ancient Greek: ὀρυκτός (oryktos, “dug up”) and λαγώς (lagōs, “hare”). [1]