القلب مهم للحياة.

A common Egyptian-style pronunciation is el-'alb mohemm lel-ḥayāh.

A more detailed breakdown:

• القلب → el-'alb
• مهم → mohemm
• للحياة → lel-ḥayāh

If you read it in a more Standard Arabic way, it would be closer to al-qalb muhimm lil-ḥayāh.

Because Arabic often leaves out the verb to be in the present tense.

So القلب مهم للحياة literally looks like:

• the heart
• important
• for life

But the meaning is naturally The heart is important for life.

In Egyptian Arabic, the definite article ال is usually pronounced el- or il- in normal speech, not al-.

So:

• القلب is said el-'alb
• الحياة is said el-ḥayāh when said by itself

This is a pronunciation difference between Egyptian Arabic and Standard Arabic, not a spelling difference.

Because both ق in القلب and ح in الحياة are moon letters.

With moon letters, the l of ال is pronounced:

• القلب → el-'alb
• الحياة → el-ḥayāh

If the word started with a sun letter, the l would disappear into the next sound, like الشمس → esh-shams.

In Egyptian Arabic, the letter ق is usually pronounced as a glottal stop rather than a q sound.

So:

• Standard Arabic: qalb
• Egyptian Arabic: 'alb

That is why القلب sounds like el-'alb in Egyptian speech.

Because مهم is the predicate adjective in the sentence, not part of a noun phrase.

• القلب المهم would mean the important heart
• القلب مهم means the heart is important

So in a sentence like this, the adjective usually stays indefinite.

Here لـ means for.

So للحياة means for life or for living in this context.

That gives the full sense:

• مهم للحياة = important for life

Because this is really two parts joined together:

• لـ = for
• ال = the

When they combine, you get لل.

So للحياة is basically ل + الحياة.

In this sentence, الحياة is pronounced roughly el-ḥayāh in Egyptian.

About the final ة:

• At the end of a phrase, it usually sounds like -a or -ah
• In more formal grammar situations, it can sound like -t when something follows it

So here, learners should think of it as ḥayāh.

Because normal Arabic writing usually leaves out short vowels.

So you see:

• القلب مهم للحياة

But a fully vocalized Standard Arabic version could show more detail, something like:

• القلبُ مهمٌّ للحياةِ

In Egyptian Arabic, those case endings are not normally pronounced in everyday speech anyway.

The wording is understandable in Egyptian Arabic and sounds natural enough, but it is somewhat neutral/formal in style.

An Egyptian speaker would often say it almost exactly the same way, just with Egyptian pronunciation:

• el-'alb mohemm lel-ḥayāh

So it works well for Egyptian learners, even though the vocabulary is also very compatible with Standard Arabic.

It can mean either in Arabic, just like heart in English.

But in this sentence, because of للحياة, it almost certainly means the physical heart, the organ needed for life.

In Egyptian Arabic, a common way is to use مش.

So:

• القلب مش مهم للحياة = The heart is not important for life

This is a very useful pattern:

• noun + مش + adjective

Yes. This is a very common pattern in Arabic:

• [noun] + [adjective] + لـ[thing]

Examples:

• المية مهمة للحياة = Water is important for life.
• النوم مهم للصحة = Sleep is important for health.
• الوقت مهم للشغل = Time is important for work.

So القلب مهم للحياة is a good model sentence to reuse.