Từ điển y khoa

Một nội tạng trong cơ thể được tạo thành từ cơ tim có chức năng duy trì sự tuần hoàn của máu. Còn được gọi là cor [danh pháp giải phẫu]. Tim được chia ra làm 4 buồng - 2 buồng nhĩ và 2 buồng thất. Buồng nhĩ trái nhận máu được oxy hóa từ phổi. Từ đó máu đi xuống buồng thất trái rồi được tống ra động mạch chủ đến các động mạch cung cấp máu cho các mô của cơ thể. Buồng nhĩ phải sẽ nhận máu trở lại sau khi chúng đi qua hết các mô và cho oxy. Máu sau đó sẽ qua buồng thất phải rồi lên phổi để được oxy hóa trở lại. Tim có 4 van chính: van nhĩ thất trái (Van 2 lá) nằm giữa nhĩ trái và thất trái; van nhĩ thất phải (van 3 lá) nằm giữa nhĩ phải và thất phải; van động mạch chủ nằm ở lỗ động mạch chủ; và van động mạch phổi nằm ở lỗ của thân động mạch phổi. Mô tim được cung cấp chất dinh dưỡng bởi máu từ các động mạch vành.

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