CHƯƠNG 15
HỆ TUẦN HOÀN
1. Cấu tạo của tim người
- Gồm 4 ngăn:
• Tâm nhĩ phải, tâm thất phải (nửa bên phải tim)
• Tâm nhĩ trái, tâm thất trái (nửa bên trái tim)
• Tâm nhĩ ở trên, tâm thất ở dưới
• Giữa tâm nhĩ và tâm thất có lỗ nhĩ thất và van nhĩ thất
! Van nhĩ thất phải: van ba lá
! Van nhĩ thất trái: van hai lá
! Nhiệm vụ: không cho máu di chuyển ngược
chiều
● Giữa tâm thất và động mạch có lỗ động mạch và van
động mạch
● Giữa tĩnh mạch và tâm nhĩ có lỗ tĩnh mạch, không có
van
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