頂二第張六第二日九十月二年戌庚慼 WAH KIU YAT PO
170英文中學會考試題預習專欄
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生物科
BTOLOGY (21)
Answer to the guastions of last week
(#~)
State, as fully as you can, the functions of the liver of a mammal.
(b) What are the funotions of (1) pylorio sphineter, (fi) duodenum, (111) ileum
(iv) neom, (v) colon, in the proows o皤 nutrition in a rabbit?
The functions of the liver of a nammal ares
1) Formation of bile - The bile functions to neutralize the acidity of the intestine sextants and to activate the pancreatio Lipase for the digestion of fats.
(1) Sternge orl
of glycogen - By enzymatic action glycogen is converted into glucose which antera the circulation of blood to maintain the normal concentration of blood.
(iii) Deamination of exoass asino-acids –
Nitrogen contained in the amino-soid - groups” is converted in the liver isto urea fer sxoretion by the kidney,
(iv) Sterage of iron - Iron from the haemoglobin
of dentroyed red blood cells is stored in the liver to supply raw material for the manufacture of new blood cells,
Formation of fibrinogan – Fibrinogen is essential element for fibrin formation, this helps the coagulation of blood during bleeding.
Storage of blood - There are multi-lobes in the liver for the storage of large amounts of blood whên bloed circulator system is over-loaded.
detoxication of poisonous substances - The toxins in the blood released by the setion of bacteria on anino-acide-in th large intestine are detoxicated in the liver
(b)(1) Pylorio sphincter – It controls the amount
ef chyme to be entered into the duodenum er retained in the stomach,
(11) Duodenum - The food in here is mixed with
the pancreatic juice and the bile. Here the protein is broken down to peptone ana amino-acida, the starch is broken down to maltose and the fats are split up
fatty acids and
glycerol.
into
報日僑華
四期星
日六廿月三年〇七九一年九十五國民中育敬騰華
(411) Ilmum - Digestion and absorption both
take place in this region. The glands and the lining of the ileum wearete five or mere entynen called the intestine južne te digest any unchanged peptones into amino-acids, maltona and other sugars intq. glucose, and unchanged fats into favty said and glycerol. Absorption of the soluble food takes place through the villi.
(iv) Casoum - In all herbivorous animals this
region is much elongated and better t developed. This region is especially for the digation of cellulose because of the preseños of certain bacteria.
(v) Gelen – This region is mainly responsible for the absorption of exosasiva water from the undigested residua. However little absorption of digested food also takes plaos' høre..
What is meant by the term "exoretion"? Describe, with the aid of a labelled diagram, the structure of a mammalian kidney and state
(0) Describe how surplus water is eliminated from
the body of a mangal.
Exoration is the process of removing the carbon dioxide and waste nitrogenous: substances in the excreta, as a result of tissue respiration, away from living cella the body of a living organism, The process usually involves special excretory organs such as the kidneys, lunga, skin, liver and colon in the body of a mammal.
(b) The diagram below is a half-nsation of
human kidneys
Cortex Medulla
Pyramids
-Medulla: -Renal
artery "Renal
Vein
Pelvis
Ureter
_A_Section (V-5.) of human Kidney
the kidney of a man is a paired organ on the dorsal side of the abdominal cavity. It is an oval-shaped body enclosed by a tough capsule.
By the naked eye, it is seen that there ire two distinot regions, the outer cortez and the inner reduļls, in a longitudinal seation
of
t
Under microscopic examination the cortex
is composed of numerous small hollow thin- walled capsules in which there is a network
of bleed capillaries. Each of these in a glomerulus where the elimination of the wastea takes place.
Leading from each of these glomeruli ie rine iube dividing into proximal tubules, convoluted tubule and collecting tubule, al. of which, collecting the wastes, pour their ends into the pelvis in the cortical layer. The pelvin collect all taa vastes in solution which enters the long tube called ureter, starting from the depressed portion of the kidney down into the urinary bladder. Punotions of the kidney azer
(1) Tafiltration of the excess water with
solutes - The liquid contains not only ures produced in the liver but also. sourished substances of we to the body such as glucose, amino-acids, and minerai salts. The excess, water is infiltrated ent of the body or partly reabsorbed by the convoluted tubules.
In the proximal tubules and collecting. tubules valuable solutes are withdrawn, How the modified liquid, containing urna and vater passes through the collecting tubule to the pelvis, then along the ureter and entera the urinary bladder.
(ii) Reabsorption of valuable materials –
Mineral salts in the form of ions are reabsorbed by the renal tubules, such at Ha and K, to balance the ions extracellularly and intracellularly, (111) Conversion of urea into urine as an
azorate – the urea synthesized by the liver is dissolved in water and sliminated through the kidney.
The surplus water is eliminated from the body of a mazmal by the following usual ways 1-- (1) By urination - Excens water in the form of urine is eliminated from the kidney to the urinary bladder where by muscular contraction the stored, urins is discharged out of the body.
(11) By respiration – During tissue respazution,
carbon dioxide and water vapour are the by-products which will be discharged out of the Lungs by the process:
V of expiration. (iii) By perspiration – waste water in the form
of sweat is perspired through the sweat pores of the skin;
gueations for this weeke
Nako a fully labelled drawing to show the structure of the skin of a memnal and give an scoount of the functions of its various parts. Wha's functions of the mammalian skin do you consider are similar to the functions carried out by the epide
of a flowering plant.
氣
腐盟
艺术
遠東海員訓練學校
第一屆畢業授憑禮
教
育
港大入學試下月廿七日開始
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在領僑市藩三
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五月九日〔期六)上午中國商中試卷mo . "
五月七日,星期四,上午生物試卷一,下午生物试卷二。
五月八日(星期五)上午中國際壳式卷一,下午中國歷史試卷。
五月五日(星期二)上午英國文學試卷】,下午英國文基試卷二1 .五月四日(星期一)上午純號,下午純數試卷二..
五月|1日,星期六上午應用英語
· 考試時間表如下:「以骸大藥向考生公佈爲準, 五月一日(星期五)上午史式卷一,下午腾史試卷二ㄧ。 四月卅日(星期四)上午物周試卷一,下午物理式後二。 四月廿九日(星期三)上午國文試卷一,下午國文试卷二19 四月廿八日入期二)上午化祭試卷一,下午出學試卷二 四月十七日(星期一)上午地图式的,下午地理試蕃1。
五月六日(星期三)上午洪文艺圈一及语文试卷一,下午出支就卷二及德文就铟二。
五月十一日八星期一)
上午國文試卷三及試卷西。
五月十三日,星期三) “五月十二日(星期二)
上午應戳試卷一,下午膳数試卷二
上午歷史式的。
五月十四日(星期四)
上午地試..
五月十五日(星期五 五月十六日八星期六
上午英國文學試卷三...
上午浊文試卷及德文試卷
在月十九日,星期二 2:上午會計理論戲圈一,下午會計理袀试卷。C南) ,計: 星期一:上午袖舞及公共事務就着一,音樂就吞一,下午經濟及公共事務試卷
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