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                    <text>След като прочетете писмото на Джоузеф Пристли до неговия приятел
Бенджамин Франклин, отговорете на следния въпрос: „Какво е имал предвид
Пристли под използван въздух и растенията връщат свежестта на
въздуха?“

Лондон, 1 юли 1772 година
Напълно съм убеден, че въздухът, който става вреден, когато го издишваме,
може да бъде възстановен от растенията. Събрах използван въздух в контейнер
и херметически запечатах този контейнер. Седем дни по-късно пуснах една
мишка в същия този контейнер. В друг контейнер със също такъв използван
въздух поставих едно растение. Седем дни по-късно пуснах една мишка в
контейнера, в който беше растението. Мишката, която беше в контейнера без
растение, умря след 5 секунди. Мишката, пусната в контейнера с растението,
живя щастливо в контейнера много минути. След това извадих мишката и я
пуснах в другия контейнер, в който нямаше растения. Горката мишка, която се
чувстваше така добре в контейнера с растението, трябваше да бъде извадена и
възвърната към живот, след като прекара една-две секунди в контейнера, в
който нямаше растения. Този експеримент ни показва, че растенията могат да
възвръщат свежестта на въздуха.

Сърдечни поздрави,
Джоузеф Пристли

�</text>
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                    <text>Хранене, дишане и отделяне при човека
Проверете наученото, като решите следните задачи.
1. В кой орган полезните вещества от смляната храна преминават в кръвта?
а) уста б) хранопровод в) стомах г) тънко черво д) дебело черво
2. Поставете в квадратчетата първите букви на думите, които отговарят на
определенията. При правилно решаване ще получите храносмилателния
орган с най-голяма дължина.

1. голяма храносмилателна жлеза
2. орган в устната кухина
3. зъби, с помощта на които храната се отхапва
4. хранителни вещества, които се разграждат най-лесно и доставят най-бързо енергия на тялото
5. основен жизнен процес, чрез който от тялото се изхвърлят непотребните
и вредните вещества
3. Наблюдавайте таблицата. Данните в нея са за 100 g от представените плодове и зеленчуци и показват:
а) колко грама белтъци, мазнини и въглехидрати има в тях
б) колко калории ни доставят
в) колко милиграма витамин С и калций* съдържат
* Калцият е необходим за костите и зъбите ни.

Състав на някои плодове и зеленчуци

Продукти
(100 g)
Домати
Картофи
Лук
Моркови
Царевица
Тиква
Банани
Ябълки
Портокали

Белтъци
(g)
0,88
2,02
1,10
0,93
3,27
1,00
1,09
0,26
0,94

Мазнини
(g)
0,20
0.09
0,10
0,24
1,35
0,10
0,33
0,17
0,12

Въглехидрати
(g)
3,89
17,47
9,34
9,58
18,70
6,50
22,84
13,81
11,75

Енергия
(калории)
18
77
40
41
86
26
89
52
47

Витамин С
(mg)
13,7
19, 7
7,4
5,9
6,8
9,0
8,7
4,6
53,2

Калций
(mg)
10
12
23
33
2
21
5
6
40

1

�3а. Отговорете на въпросите.
– Кой продукт съдържа най-много белтъци?
– Кой продукт съдържа най-малко мазнини?
– Кой плод съдържа най-много въглехидрати?
– Кой продукт може да ни осигури най-много енергия?
– Кой от плодовете и кой от зеленчуците има най-много витамин С?
3б. Избройте плодовете и зеленчуците в последователност, която отразява
намаляването на калция в тях.
4. Защо ескимосите и други народи, които живеят при студен климат, консумират много храни, богати на мазнини?
5. В кой орган се извършва обмяната на кислород и въглероден диоксид?
а) нос
б) гръклян
в) трахея
г) бели дробове
6. Разгледайте таблицата и анализирайте данните в нея. Числата показват какви количества кислород, въглероден диоксид и глюкоза* има в 100 mL кръв
преди и след преминаването Ӝ през активно работещ мускул.
* глюкоза – въглехидрат, който е храна за клетките
100 mL кръв
Кислород
Въглероден диоксид
Глюкоза

Преди преминаването
през работещ мускул
21 mL
45 mL
90 mL

След преминаването през
работещ мускул
5 mL
60 mL
81 mL

Как се променят количествата на двата газа и на глюкозата след преминаването на кръвта през работещия мускул? Защо? Какви процеси извършват мускулните клетки?
7. Прочетете текста и предложете подходящите думи за местата с многоточия.
Дишането може да се сравни с горенето. При горенето в двигателя на автомобила бензинът изгаря благодарение на кислорода във въздуха и се получава
енергия за движението на колата. По сходен начин в организмите храната „изгаря“ благодарение на приетия … и това осигурява … на всички клетки.
8. Избройте в правилна последователност отделителните органи на човека. В
кой от тях се образува урината?
а) пикочен канал
б) бъбреци
в) пикочен мехур
г) пикочопроводи
9. Направете твърденията верни, като изберете по един от изразите, предложени в скобите.
а) Развалените нелекувани зъби (могат/не могат) да нарушат дейността
на бъбреците.
б) Слънчевите бани между 12 и 15 часà (не са опасни/трябва да се избягват).
в) При лоша хигиена микроби (могат/не могат) да предизвикат възпаление на пикочния мехур.
г) Дебелото черво е орган на (храносмилателната/отделителната) система.

2

�</text>
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