Anonymous
Anonymous asked in 科學及數學生物學 · 1 decade ago

CE問題...關於artery wall既特徵同function...

the wall of artery is muscular to

a. withstand high blood pressure

b. propel blood forward by recoiling

c. regulate the amount of blood flowing to organs

d. maintain higher blood pressure

答案係C...

但係我想搵人解釋下d選擇點解岩?點解錯?...除左b個個選擇

即係artery係 靠elastic定thick定muscular黎maintain higher blood pressure?

regulate the amount of blood又係靠elastic定thick定muscular?

withstand high blood pressure又係靠elastic定thick定muscular?

2 Answers

Rating
  • 1 decade ago
    Favorite Answer

    條選擇題係問動脈的wall由肌肉組成有咩用,由肌肉組成最大既特質就係可以contrast同relax。而regulation of the amount of blood flowing to organs就係靠muscle既contrast同relax,所以c就係答案。

    而 withstand high blood pressure就係靠個wall muscle既thickness,所以muscle既thickness先係 withstand high blood pressure既主因而唔係muscle,所以a唔係答案。

    而propel blood forward by recoiling主要係靠個elasticity of muscle wall而唔係個muscule本身,就係因為有彈性,血管可以〝吱〞d 血向前,所以b就唔係答案。

    而maintain higher blood pressure都係靠elasticity of muscle wall,所以d都唔係答案。

    -就只有c先係答案。

  • 1 decade ago

    身體會因應不同情況增加或減少血液流向某個器官的, 例如天氣寒冷時會少d 血流向表皮以減少熱量流失; 相反天氣熱時會多d 血流向表皮以幫助散熱.

    呢個過程係靠控制動脈壁的肌肉去將動脈收縮 / 擴張, 當肌肉收縮, 動脈空間減少, 通過的血液自然減少; 相反肌肉放鬆, 動脈的空間增加, 通過的血液亦自然增加

    動脈既係 muscular 亦係 elastic, elastic 的確係可以幫助 withstand high blood pressure, 但而家題目係講緊 muscular, 雖然 withstand high blood pressure 都有d 關, 但要 regulate the amount of blood 就非 muscular 莫屬, elastic 係唔能夠做到呢樣野的

    所以 C 係 best answer

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