题目内容
（请给出正确答案）
A、both symmetric and asymmetric cell divisions
B、more symmetric cell divisions than asymmetric
C、normally only asymmetric cell divisions
D、normally only symmetric cell divisions
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“Divisions of stem cells in adult tissues/organs include”相关的问题
A、tendon
B、cartilage
C、joint
D、rib
Stem Cell Therapy May Help Repair the Heart
According to scientists in the USA, stem cell therapy may one day be able to repair the hearts of people with heart failure.Researchers at Pittsburgh University School of Medicine examined 20 patients who had severe heart failure and were going to have surgery.
They injected stem cells into the parts of their hearts that were damaged. They then compared their hearts with those of people who had undergone surgery without having the stem cells injected into them (they had also suffered from severe heart failure ) . The patients who had the stem cells injected had hearts that were able to pump (用泵抽运) more blood than the others.
According to Professor Robert Kormos, one of the researchers, these results could revolutionize heart treatment. Although previous studies had indicated that there might be a benefit, this is the first study that has actually proved that stem cell therapy can help the failing heart work better.
All the patients in this study had hearts that could not pump blood properly. The scientists measured their ejection fraction (射血分数 ) . It is a measure of heart performance; you measure how much blood is being pumped out by the left ventricle (心室) .
Healthy people&39;s ejection fraction is about 55%. These patients had ejection fraction of under 35%. They all had by-pass surgery (搭桥手术) performed on them. Some of the patients had stem cells taken from their hip bones and injected into 25-30 sites in the damaged heart muscle. Six months later their ejection fraction rate was 46.1% while those who just had surgery but no stem cell injections averaged 37.2%.
Heart failure is a common problem all over the world.In the UK alone about 650,000 people suffer from heart failure every year. As the number of people suffering from heart failure increases in the word in general these findings are particularly significant.
Current treatments relieve the symptoms. This new stem cell therapy actually repairs the damaged muscle in the heart and has the potential of curing the disease.
The 20 patients had stem cell injections instead of surgery. 查看材料
A.Right
B.Wrong
C.Not mentioned
A、The apical par complex is the master regulator that activates the crumbs complex and is inhibited by the scribble complex
B、The apical par complex is the master regulator that activates the crumbs complex and inhibits the scribble complex
C、the crumbs complex inhibits the Scribble complex and defies the basal and lateral surfaces
D、the scribble complex defies the basal and lateral surfaces and directly inhibits the crumbs complex
A、death signal the Fas ligands bind to their Fas receptors, leading to dimerization and activation of the death receptor, which initiate the “cell Murder” apoptosis
B、the effector “destruction” caspases are activated by dimerization with each of the subunit to stabilizing the active sit of the other
C、“destruction” caspases can cleave one and another including the initiator caspases
D、caspase8 and caspase9 are the initiator “killer” protein respectively in the immune system and in the others
A、生活、艺术家、艺术品和创作活动
B、生活、艺术品、欣赏者和欣赏活动
C、艺术家、艺术品、欣赏者和创作、欣赏活动
D、生活、艺术家、艺术品、欣赏者和创作、欣赏活动
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