1972-03-23 — Page 22

頁二第張六第25日九初月二年子壬歷

香僑榮

1972英文中學會考試題預習專欄-

WAH KIU YAT PO

Keya

left

right

auricle

artery

flow of

m. ventricle

聖道英文機院主編

生物科

(廿一)

abdomen.

Biology (28)

Study of heart and blood;

I HEART: structure and function

POSITION -

The heart of mammal is situated on the ventral side of the body, between the two lungs in the thoracic region. just anterior to the diaphragm. It is surrounded by a thin colourless seabrane called pericardium or pericardial nom brane.

FUNCTION 2

The pumping action of the heart. muscle (cardiac muscle) helps to circu- late the blood around the body. The per icardium is to protect the heart, reduc- ing the friction between it and the sur rounding structures during ite movement.

STRUCTURE:

(3)

The heart chambera — the heart is divided into 4 chambera.

1. The two anterior chambere are

called reft & right auricles (or atria, Singular - atrium). They have thinner walls & smaller in B120" Function:

the

(C) Valven

receive- blood from different parts of the

posterior chambers are Teft and right ventricles. They have much thicker walle and sre much larger in size. Pinotion to pump the blood away from the heart to vari ous parts.

This is a muscular layer separating the heart into left and right.

There are valves situating between the auricles and the ventricles.

Between the left auricle and the left ventricle is the bicuspid or mitral valve' which is composed of two flaps of muscular tissue. Between: the right auricle and the right ventricle ia the tricuspid valve which is composed of three flaps. Functions

to prevent the blood" from flowing back from the ventricles. huriciode

(D) Blood vessels joining to the hearts-

Blood vessels connected to right auricle The posterior vena cava or main vein, collecting: blood from the main part of the body; and two anterior vena cavas :collecting blood from the anterioF

region (head, & arms)

Blood vessels connected to right ventricles The pulmonary, art- eries passing the deoxy-genated blood to the lungs,

To the left auricle - The pul- monary veins are conducting the orygenated blood

to the heartë

To left ventricle -- The aortic aron which is a very thick blood. vessel joining to the dorsal aorta or main artery, passing the blood to all parts of the body. înere are valves at the bases of the pulmonary arteriee and the aortic arch (these vessels pass blood away from the heart) called semilunar valves (half- mdon valves) used to prevent the backw flow of blood into the ventricles.

Diagram of heart

500v) onal View

arch

anterior vena

pulmonary

cavae

posterior

vena cava

semilunar

valve

tricuspid

2.4.

>pulmon

bicuspid (mitral)

valve

from:

報日僑華

Heart in

Man

Pericardium

Pericardis

Cavity

Heart

(liquid)

(1) Distribution of food

Digested food substances, vitamine, mineral salts and water are absorbed from the alimentary canal and transported to every part of the body...

一,假旺角新體蓓球平行一話K八五四三領取一

[勦大校友

育教僑華

四期星日三廿月三年二七九一曆公年一十六國民華中

一

精

廿九日辦青年綜合晚會.

慶祝青年節

| 沓年綜合晚會。 ..是項活動之Ë飾安

午道阴党中心證堂舉辦 一日下午八時,假九黼太 同李協會將於三月廿九 香香本上,九屆理監事就職

宁元,歡迎各校友

,頒發浵任證書,對熒 院長雪村主持良英 式,發校前文理學 每位十五元,直系晃女

名單台闢、庞 第九理監事會體角名

「撬命已於數月前成立,一個向親友參加。又想會

餅,台米子束,

唱,無名氏大演安

·琴獨棻,粗此至小中月人 张演府,謝演林中音大 底 中山大學 小提琴家歐成懂之小提 兆滿?開而不。一

七「媽,經爾坐院音活剂可監事長許变强,耐 術歇明,楚關心婚蹈班 審核李振先,至華濃, 離之無刻薄視及寳唱 來長榮世烈,林天帝。 |妹芭獁學校级润現代一兆鈞,梁業會,頂 一,说大仙猫利署社」,甘何,學術古设期

潤!樂器演奏,太激礬、克述,馬搬飾,甘茲來 大致可分樁,舞阳一善才,何眞◎聯爺陳

一撈文强,絶百元坤?橅$梨兆, 楊樹光、光躍,質傳事長許 還

·點、陳金,節目,理事長羅文本,而現 |-財政杳 計滿生,會,眾讚文

大學同港香大中

叙日學同底月

次關魚時侑爲同日午七時,假九

從麵

原來光你

·薇迎校友攜眷及親友參加

下月舉辦週末營)

一元,五元兩樣,寫有力一同學日航歡包羹,榮樂在魯地,來往車籍、聯低聯會、德就業職

放入煜学,即日起在明

|京迎各院校負責奔事治

六一八六四七;元,蔡如體:香港軒尼 七六四八;北售作為負責人,新開!

後五六永道將活計晚方店集新月 安八九 第二,費助有關合物

相繼要一片,打C四七假佳

四句二七八雕街三五、 十乍號 〇 第三樓二心如, 人街七三,三五

晚街五珠 月號政八余:開日、一往分口及

「K八,香榮K三纸 宾尼 八寧七糖 入九案導 七房二路

聯盟 商都否定我

粵華中學校友會

香港專上同學協會

理柯縈授盃:

19

Heart and Pericardium

II. GENERAL FUNCTIONS OF BLOOD

中文中學會考試題預習專欄

數學科 (廿一)

(b+9)=

(c+6)

(c+a)= ((+b)

•((+4) (6+ ()

張正邦

(a+b)(6+a)

得b+c

att

第二十次預習題解答

ara tan tank - 證,左端

(5-0)(5-4)

s(sa)

右端

(c+4) (b+c) (cta) (b+c) (a+b) ((ta) (a+b)(6

Yote Yeta, Ya+b E 級數

例一滴形之邊順次是7,8及,求到

中绲長一

O(AB+AC*) =BC+4m2 ← 2(8+?')=9+4m2

4m2=145

atb

(2) Removal of waste producta of metabo-

The waste products are extracted: from various parts of the body and passed to the exorstory organe for elimination,

such as the kidneys and the sweat glands. (3) Distribution of oxygen

The haemoglobin in the red blood cells takes up ożygen from the lungs, to form oxyhaemoglobin. In this form the gas is carried to all tissue cells where it is used to oxidise the food to release energy for body activities. A small amount of oxygen is carried in solution form in the plasma.

(4) Removal of carbondioxide.

The blood absorba carbondioxide from

different paste of the body and carry it. to the lunge for elimination.

The CO2

1 carried in the blood in various wayat About 65% in form of sodium bicarbon-

CO2 + Na2 CO2 + H2O

tasaue cell

in lungs

30% in the red blood corpuscles comb-

ining with the haemoglobin.

5% dresolved in the blood plasma

combined. in other ways as in form

of potassium biscárbonate etc.

(5) Clotting of blood.

When the blood is exposed to the

wounded tissue it will clot. The

purpose of blood clotting in

a, to prevent further loan of blood from

the body.

to oppose the entry of bacteria at the wounds into the body.

(6) Defence of the body — against harm-

ful substances,

a. The white blood cells produce antibo- dies to neutralize or destroy the pow isonous substances such as toxins found in the blood.

Some leucocytes: can ingent and destroy: the bacteria gained entry into the body

(7) Distribution of hormones -

The hormonea produced by the ductless (endocrine) glands enter the blood stream directly and are transported to the ef- fector organs where they can produce. their effects.

(日) Regulation of body temperature

(This is important for warn-blooded

animale

a. The expansion of the blood capillaries near the surface of the skin helps to dis- sipate the excess heat from the body to the surrounding atmosphere. These cap- illarise will contract under cold cond- ition to prevent loss of heat. S b. The sweat extracted from the blood the sweat glands will evaporate from the surface of the skin thue taking away the excess body heat..

c. Distribution of heat- the heat from heat producing organa such as the liver

and the kidneys is carried to other parta of the body by ther blood.

(9) Gives turgidity --

It provides turgidity to certain parts of the body such as the firmnem of the skin,

誰左端

6)

一右端:

試證

Sin Sis

左端二

al

以中項之半其結果成等比級數.

ab

線證明 mc = //202+262c

例三三角形之邊順次是 22,11及21求對

4.數成調和級数求龍數減

A

1+xy sab-0

4 = atb

22+1

將及y之值代入1

(bta)(b~a) = (c+b)((-b)

b+c

两端除以(c+a)得

a+b

ba

(b+c) (eta)

(a+b)(c+a)

(ta) (b+c):

(a+b) (c+a)

2=144

May DABC 19 Q=10 6=15, hc=6

求其外樓團之半程

dh = ab

ok=69=10

d=10×5=25

第二十一次預習題

ISDABC & a = 28, C=32, Mc = 38

2.平行四邊形兩邊平方之和,等於對

3.三周形之邊順水是6.367求對應

st ab- abc?

·⋅ (a+b)2.

AB=4吋AC=5吋求BC上之高

△ABC 内.9 = 9,6212,设外接圆

直径等径15.求c.