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  2. Purkinje fibers - Wikipedia

    en.wikipedia.org/wiki/Purkinje_fibers

    The Purkinje fibers, named for Jan Evangelista Purkyně, (English: / p ɜːr ˈ k ɪ n dʒ i / pur-KIN-jee; [1] Czech: [ˈpurkɪɲɛ] ⓘ; Purkinje tissue or subendocardial branches) are located in the inner ventricular walls of the heart, [2] just beneath the endocardium in a space called the subendocardium.

  3. Quark - Wikipedia

    en.wikipedia.org/wiki/Quark

    Quarks have fractional electric charge values – either (− ⁠ 1 / 3 ⁠) or (+ ⁠ 2 / 3 ⁠) times the elementary charge (e), depending on flavor. Up, charm, and top quarks (collectively referred to as up-type quarks) have a charge of + ⁠ 2 / 3 ⁠ e; down, strange, and bottom quarks (down-type quarks) have a charge of − ⁠ 1 / 3 ⁠ e.

  4. Cardiac conduction system - Wikipedia

    en.wikipedia.org/wiki/Cardiac_conduction_system

    A slow heart rate of 60 or less beats per minute is defined as bradycardia. A fast heart rate of more than 100 beats per minute is defined as tachycardia. An arrhythmia is defined as one that is not physiological such as the lowered heart rate that a trained athlete may naturally have developed; the resting heart rates may be less than 60 bpm.

  5. 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]

  6. If Someone Sends You *This* Heart Emoji, They Might ... - AOL

    www.aol.com/someone-sends-heart-emoji-might...

    Brown Heart. This was the least used heart emoji on Twitter in 2021, per Emojipedia. That said, it does have its own unique purposes: Emojipedia's data shows that words like "skin" and "Black" are ...

  7. What Do All the Heart Emojis Mean? A Guide To Using the ... - AOL

    www.aol.com/lifestyle/heart-emojis-mean-guide...

    Choosing the right heart emoji to add to a message or caption can be difficult, given the many options. Here's a guide to every color and type of heart emoji.

  8. Pericardium - Wikipedia

    en.wikipedia.org/wiki/Pericardium

    The pericardium (pl.: pericardia), also called pericardial sac, is a double-walled sac containing the heart and the roots of the great vessels. [1] It has two layers, an outer layer made of strong inelastic connective tissue (fibrous pericardium), and an inner layer made of serous membrane (serous pericardium).

  9. Here's the 411 on All the Different Meanings for Heart Emojis

    www.aol.com/lifestyle/heres-411-different...

    One of the few heart emojis with a totally clear-cut meaning, this yellow and mellow fellow stands for platonic love. Send it to close friends, folks you'd like to get to know better, social media ...