normal artery and cholesterol blocked artery. clogged arteries caused by cholesterol. normal veins and varicose veins. types of cholesterol in the blood concept. high-density lipoprotein (hdl) and low-density lipoprotein (ldl). - 脂肪細胞 幅插畫檔、美工圖案、卡通及圖標人體構造, 老化過程, 三酸甘油脂
medical illustration of human adipose connective tissue (body fat) - 19th century - 脂肪細胞 幅插畫檔、美工圖案、卡通及圖標