Name: 10.5 鉱物鉄 (10.5 Minerals: Iron)
Uploaded: 2021-01-14T05:45:50.000Z
Duration: 12 min 8 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

- HELLO, AND WELCOME TO OUR FIFTH SECTION

I'M GOING TO START BY REVIEWING THE TRACE MINERALS.

REMEMBER, WE REVIEWED THE MAJOR MINERALS INITIALLY.

THOSE ARE MINERALS THAT ARE REQUIRED IN FAIRLY HIGH AMOUNTS.

IT JUST MEANS THAT WE REQUIRE LESS OF THEM.

WE'RE GOING TO BE COVERING THE FIRST FIVE.

AND IT'S NOT THAT THESE ARE NOT IMPORTANT,

IT'S JUST THIS IS WHERE OUR FOCUS WILL BE.

THE MAIN FUNCTION OF IRON IS IN OXYGEN TRANSPORT,

NOW IT DOES THIS BY BEING PART OF WHAT'S CALLED HEME.

THAT'S IN OUR RED BLOOD CELLS, AND MYOGLOBIN,

SO THESE ARE COMPOUNDS THAT WILL CARRY IRON.

THIS IS ACTUALLY A PICTURE OF HEMOGLOBIN.

THEY'RE A STRING OF AMINO ACIDS, AND THEY END UP COILING

AND THEN THEY FOLD AND THEN THEY JOIN TOGETHER.

WHICH YOU CAN SEE HERE, AND PART OF THAT HEME IS IRON.

SO IRON IS NECESSARY TO FORM THIS COMPLEX,

MOST PEOPLE HAVE HEARD OF IRON DEFICIENCY ANEMIA,

THEY'RE USUALLY FATIGUE, A LOSS OF ENERGY.

WELL, IF YOU DON'T HAVE OXYGEN GOING TO YOUR TISSUES,

YOU'RE DEFINITELY GOING TO FEEL LIKE YOU HAVE A LOSS OF ENERGY.

YOU CAN HAVE IRON DEFICIENCY WITHOUT ANEMIA, AS WELL,

AND THESE ARE SYMPTOMS THAT AREN'T QUITE AS SEVERE.

ONE IS A HEME IRON SOURCE AND ONE IS A NON-HEME.

HEMOGLOBIN IS GOING TO CARRY OXYGEN IN THE BLOOD,

SO THIS IS ONLY GOING TO OCCUR IN ANIMALS.

NOW THE ABSORPTION BETWEEN THESE TWO IS VERY DIFFERENT.

THE ABSORPTION RATE IS GOING TO RANGE ABOUT 15 TO 35%,

NON-HEME IRON MEANS THAT IT DOES NOT HAVE HEMOGLOBIN.

WELL, PLANTS, PLANTS DON'T HAVE RED BLOOD CELLS

THAT ARE CARRYING OXYGEN AROUND TO THEIR TISSUES,

YOU WILL ALSO FIND SOME NON-HEME SOURCES IN ANIMALS, AS WELL.

PLANT SOURCES AND HEME IRON FROM ANIMALS.

THE NON-HEME SOURCES ARE NOT ABSORBED AS WELL.

AND WE'RE GOING TO GO OVER THIS IN JUST A MINUTE,

SO FOR MOST OF YOUR SOURCES THAT ARE NON-HEME,

THAT MEANS THAT EVEN THOUGH THEY MIGHT CONTAIN

A LOT OF IRON WHEN YOU CONSUME THEM THAT IRON

AND THEREFORE IT CAN'T BECOME PART OF YOUR RED BLOOD CELL.

ANIMALS HAVE HEMOGLOBIN, THEY HAVE RED BLOOD CELLS THAT

CARRY OXYGEN TO ALL THE  TISSUES, HEME IRON.

THERE IS ALSO SOME IRON IN BOTH POULTRY AND FISH,

BUT THAT'S NOT A COMMON FOOD THAT PEOPLE EAT.

AND THEN EGGS, EVEN THOUGH WE THINK OF THIS

AS AN ANIMAL SOURCE IS ACTUALLY A POOR SOURCE,

IT'S NOT WELL-ABSORBED, WHICH I'LL TALK ABOUT NEXT.

SO SOME OF THESE ANIMAL FOODS HERE WILL HAVE NON-HEME IRON.

THE REMAINING FOODS ARE GOING TO BE PLANTS,

TOFU, THESE ARE ALL GOOD SOURCES OF NON-HEME IRON.

BUT A LOT OF THESE SOURCES ARE FAIRLY POORLY ABSORBED.

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10.5 鉱物鉄 (10.5 Minerals: Iron)

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