Vi sao gian mat dau van song?

Con vat bi nhieu nguoi ghet bo nay co ban nang sinh ton cuc manh. Mat dau, song chung van song them hang tuan. Cac nha khoa hoc da kham pha vi sao chung lam duoc dieu do, con nguoi thi khong.

Nha sinh ly hoc va hoa sinh hoc Joseph Kunkel, tu Dai hoc Amherst, Massachusetts (My), da nghien cuu su phat trien cua gian de tim ra nguyen nhan song sot cua gian khi mat dau, va tim hieu tai sao con nguoi khong the lam dieu do.

Dau tien, viec mat dau o nguoi se dan den ket qua la mat mau va huyet ap giam den muc khong the van chuyen oxy va chat dinh duong toi cac mo trong co the. "Nguoi ta mat mau ma chet", Kunkel binh luan.

Ngoai ra, con nguoi tho bang mieng hoac mui va nao kiem soat cac chuc nang song con nay, vi the khi mat dau, viec tho cung ngung luon. Hon nua, co the nguoi khong the an duoc neu khong co dau, dam bao mot cai chet doi chac chan.

Song, gian khong bat buoc phai co huyet ap theo cach cua con nguoi. "Chung chang co mang luoi mach mau rong khap nhu cua chung ta - nghia la cac mach ti hon can ap suat lon de mau co the luu thong. Chung co mot he tuan hoan mo, voi ap suat thap hon nhieu".

"Neu ban cat dau chung, cai co se duoc lien lai bang mau cuc. Khong he co su kiem soat chay mau o day", Kunkel noi.

Sinh vat nay cung lay khi troi bang cac lo tho, nam tren cac dot co the. Ngoai ra, nao cua gian khong kiem soat qua trinh tho nay va mau khong can mang oxy di nuoi cac noi tang. Thay vao do, cac lo tho hut khong khi truc tiep vao cac mo thong qua mot loat ong nho goi la khi quan.

Ngoai nhung yeu to tren, gian con la mot sinh vat mau lanh, nghia la chung can it mau hon nhieu so voi hoat dong song cua con nguoi. "Mot con con trung co the song sot trong hang tuan voi mot bua an ma chung co", Kunkel noi.

Nha con trung hoc Christopher Tipping tai Dai hoc Delaware Valley o Doylestown da thi nghiem cat dau hai con gian chau My, "rat can than duoi kinh hien vi", va lam lanh vet thuong bang sap, ngan cho chung khoi chet vi mat dich. Ket qua la hai con vat keo dai tuoi tho them vai tuan trong mot cai binh. "Chung dung vung, so vao nhau va di chuyen".

Khong chi co the cua chung song sot ma khong can dau, ban than cai dau gian cung song sot, vay rau vai gio truoc khi mat het nuoc. Neu duoc tiep dinh duong va lam lanh, no co the song lau hon.

theo Scientific American