electron microphotography clearly shows the three cellular components of blood and how blood cells are manufactured in the bone marrow. shows how the... - 動脈 血管 個影片檔及 b 捲影像00:37水滴
doctor doing the doppler ultrasound test evaluation of blood vessels on a senior female patient - 動脈 血管 個影片檔及 b 捲影像00:19體檢
alcohol: pink elephant - part 9 of 26. the genial pink elephant in this cartoon refuses to be a figment of anyone's imagination. he takes a tippler in hand and convinces the man that he has an alcohol problem. solid factual information about the causes an - 動脈 血管 個影片檔及 b 捲影像00:30
the tobacco problem: what do you think? - part 16 of 28. presents historical perspective and timely data on the smoking habit and health risks. although ad campaigns continue to glamorize smoking, researchers demonstrate that heavy smoking now is known to - 動脈 血管 個影片檔及 b 捲影像00:33吸煙