biology multiple choice

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1.After drinking a lot of salty soap,a healthy person will produce

A.a small voume of urine with high concentration of salt
B.a small voume of urine with low  concentration of salt
C.a large voume of urine with high concentration of salt
D.a large voume of urine with low  concentration of salt

我知一定係high concentration .. A或者C係岩..
但係個volume係small 定 large呢~? 書寫more urine with a high concentration of salt is produced. 咁應該係C !?

2.which of the following structure of mammalian skin is not involved in temperature regulation?

A.oil glands
B.nerve endings
C.erector muscles
D.blood capillaries

貌似4個都會= = ??
係唔係D ? 因為係arterioles constrict或者dilate..
唔關blood capillaries事 .. ? 謝謝..

lawkanok

係large volume同high concentration,好似同water potential有關......
blood capillaries....EAA好似唔受佢玩係temperature regulation lu

Royal

1.After drinking a lot of salty soap,a healthy person will produce

A.a small voume of urine with high concentration of salt
B.a small voume of urine with low  concentration of salt
C.a large voume of urine with high concentration of salt
D.a large voume of urine with low  concentration of salt

係salty soap定salty soup呀??
應該係CE level吧? 如果係excess intake of salt
身體為左放走多d鹽, 就唔會去reabsorb返d鹽(mechanism連AL都out左)
然後因為d鹽仲o係度, 咁d水亦都會留返低 (water potential既問題)
所以答案應該係C. 綠紅藍果SET CE書亦都有講過

我當年記呢個concept都記得好唔舒服
始終kidney有好多既function都係關hormone事
但係CE bio對hormone既介紹又太少
都係果句, 記左佢算

2.which of the following structure of mammalian skin is not involved in temperature regulation?

A.oil glands
B.nerve endings
C.erector muscles
D.blood capillaries

我都估係D, 因為wall of capillaries係唔識contract/relax

鴨

第一題是C沒錯
雖然因為飲用大量高鹽度的液體讓身體water potential下降
但是由於同時攝取大量水份
故在reabsorption時是不會reabsorb大量水的
不過在這所涉及的有關乎大量的receptor問題
CE不用考究太多

第2題不是oil glands ?
參與temperature regulation的是sweat gland和subcutaneous fat不是oil gland吧
blood capillaries是有參與
因為它負責讓血液流經表面來散熱的

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果本JOINT US SOLUTION寫第1題係A .. 第2題係D
唔通佢錯!?

另外仲有題,,我最弱係肌肉果科=.=
我無從入手=.=

                               
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屈
伸
伸

這圖就是看那個肌肉變粗了
小腿肌肉我就會背位置(前二後三)
大腿就相反

P是biceps,使下肢屈曲所以一定收縮
而大小腿開始變直即是triceps收縮
所以我估B
另外我需要這題目的年份
拉麵仔 發表於 13/2/2010 11:55 PM

                               
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呢題我都係撞B..
係1993年的,,但係答案係D..
我覺得好怪,,P同Q點可能一齊CONTRACT...
但係會考答案同JOINT US 都係寫D...

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呢題我都係撞B..
係1993年的,,但係答案係D..
我覺得好怪,,P同Q點可能一齊CONTRACT...
但係會考答案同JOINT US 都係寫D...
小霞的fans 發表於 15/2/2010 12:48 AM

                               
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先唔好理佢係一二三四定五頭肌。
你睇幅圖加少少聯想就知係Q,S同T contract，當年我乜野muscle理論都冇記就去考CE Bio，呢類題目都係靠睇圖。

T contract令本身短左 => 兩舊骨距離細左。
S係連住最下面條骨尖端，contract時會拉直隻腳。
Q係連住最中間條骨尖端，contract時會拉直隻腳。

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謝謝解答,,我明左
我想問多1條CHEM既問題..

2CrO4^2(aq)+2H^+(aq)  => Cr2O7^2-(aq)+H2O(l)

which of the following statement concerning the above reaction is correct?
A.the solution changes from yellow to orange
B.it is a redox reaction
C.H+ (aq) ions are oxidized
D.CrO4^2 (aq)ions act as an oxidizing agent

我知A同D都唔岩 . 但係B同C 就唔係太肯定..
C? H+ gain oxygen atom 變左H2O 即係佢oxidize 左 ??

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謝謝解答,,我明左
我想問多1條CHEM既問題..

2CrO4^2(aq)+2H^+(aq)  => Cr2O7^2-(aq)+H2O(l)

which of the following statement concerning the above reaction is correct?
A.the solut ...
小霞的fans 發表於 6/3/2010 04:03 PM

                               
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A.

O.N. of Cr in L.H.S. = -2+8 = +6
O.N. of Cr in R.H.S. = (-2+14)/2 = +6
O.N. of H in both sides = +1
=> B,C,D are wrong.

[CrO4]2- is yellow while [Cr2O7]2- is orange. => A.