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🩸 𝐇𝐞𝐚𝐫𝐭🩸 🩸𝐦𝐞𝐬𝐨𝐝𝐞𝐫𝐦𝐚𝐥𝐥𝐲 derived organ 🩸 situated in the 𝐭𝐡𝐨𝐫𝐚𝐜𝐢𝐜 𝐜𝐚𝐯𝐢𝐭𝐲, in between the two lungs, slightly tilted to the 𝐥𝐞𝐟𝐭. 🩸size of a clenched 𝐟𝐢𝐬𝐭. 🩸protected by a 𝐝𝐨𝐮𝐛𝐥𝐞 walled membranous bag, 𝐩𝐞𝐫𝐢𝐜𝐚𝐫𝐝𝐢𝐮𝐦, enclosing the 𝐩𝐞𝐫𝐢𝐜𝐚𝐫𝐝𝐢𝐚𝐥 𝐟𝐥𝐮𝐢𝐝. 🩸 Has 𝐟𝐨𝐮𝐫 chambers: 𝐭𝐰𝐨 relatively small upper chambers: 𝐚𝐭𝐫𝐢𝐚 and 𝐭𝐰𝐨 larger lower chambers: 𝐯𝐞𝐧𝐭𝐫𝐢𝐜𝐥𝐞𝐬 🩸A thin, muscular wall called the interatrial septum separates the right and the left atria 🩸𝐭hick-walled, the inter-ventricular septum, separates the left and the right ventricles 🩸atrium and the ventricle of the same side are also separated by a thick fibrous tissue: 𝐚𝐭𝐫𝐢𝐨-𝐯𝐞𝐧𝐭𝐫𝐢𝐜𝐮𝐥𝐚𝐫 𝐬𝐞𝐩𝐭𝐮𝐦 🩸opening between the right atrium and the right ventricle is guarded by: 𝐭𝐫𝐢𝐜𝐮𝐬𝐩𝐢𝐝 𝐯𝐚𝐥𝐯𝐞 🩸 opening between the left atrium and the left ventricle is guarded by: 𝐛𝐢𝐜𝐮𝐬𝐩𝐢𝐝 𝐨𝐫 𝐦𝐢𝐭𝐫𝐚𝐥 𝐯𝐚𝐥𝐯𝐞 🩸openings of the right and the left ventricles into the pulmonary artery and the aorta: 𝐬𝐞𝐦𝐢𝐥𝐮𝐧𝐚𝐫 𝐯𝐚𝐥𝐯𝐞 🩸A specialised cardiac musculature: nodal tissue is distributed in the heart 🩸 patch of this tissue is present in the right upper corner of the right atrium called the 𝐒𝐢𝐧𝐨-𝐚𝐭𝐫𝐢𝐚𝐥 𝐧𝐨𝐝𝐞 (𝐒𝐀𝐍) 🩸Another mass of this tissue is seen in the lower left corner of the right atrium close to the atrio-ventricular septum: 𝐚𝐭𝐫𝐢𝐨-𝐯𝐞𝐧𝐭𝐫𝐢𝐜𝐮𝐥𝐚𝐫 𝐧𝐨𝐝𝐞 (AVN) 🩸 branches give rise to minute fibres throughout the ventricular musculature of the respective sides: 𝐩𝐮𝐫𝐤𝐢𝐧𝐣𝐞 𝐟𝐢𝐛𝐫𝐞𝐬 🩸 fibres alongwith right and left bundles are known as 𝐛𝐮𝐧𝐝𝐥𝐞 𝐨𝐟 𝐇𝐢𝐬 🩸SAN: 𝐩𝐚𝐜𝐞𝐦𝐚𝐤𝐞𝐫 𝙒𝙧𝙞𝙩𝙩𝙚𝙣 𝙗𝙮 : 𝙘𝙖𝙣 𝙘𝙤𝙣𝙩𝙖𝙘𝙩 𝙞𝙁 𝙩𝙝𝙚𝙧𝙚 𝙞𝙨 𝙖𝙣𝙮 𝙢𝙞𝙨𝙩𝙖𝙠𝙚 𝙞𝙣 𝙖𝙗𝙤𝙫𝙚 @THE_TRIUMPHANT_PERSON 𝙅𝙊𝙄𝙉 👉 @NTA_NEET_OFFICIAL