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MCAT Basics (from MedSchoolCoach)

The Digestive System

MCAT Basics (from MedSchoolCoach)

MedSchoolCoach

Science

4.6612 Ratings

🗓️ 8 April 2025

⏱️ 50 minutes

🧾️ Download transcript

Summary

In this episode, we'll break down the intricate processes of nutrient digestion and absorption, from the mechanical and chemical digestion in the stomach to the vital role of the small and large intestines. We'll also discuss the regulatory mechanisms involving hormones and nervous innervation and the essential structures like the liver, gallbladder, and pancreas. And don't forget, this episode is packed with tips on everything you need to know about this high-yield topic for the MCAT.

So grab your notes, get comfortable, and let's embark on this fascinating journey through the digestive system. Stay tuned for a deep dive into how our bodies turn food into the vital nutrients we need to thrive.

Visit MedSchoolCoach.com for more help with the MCAT.

Jump into the conversation:

[00:00] Introduction to the MCAT Basics

[05:11] Digestive system involves mechanical and chemical processes.

[06:55] Food travels through digestive system over time.

[10:48] Small intestines: duodenum, jejunum, ileum, enterocytes crucial.

[14:38] Sphincters in digestive system control food movement.

[16:26] Podcast discusses physiology of digestive system structures.

[20:57] Salivary enzyme breaks down starch into glucose.

[23:46] Muscle contractions propel food through digestive system.

[27:40] Lipase enzyme breaks down fats in stomach.

[29:11] Stomach doesn't absorb nutrients, protects itself.

[32:55] Enzymes linked to cells for carbohydrate breakdown.

[38:05] Bile emulsifies fat, chylomicrons enter lymphatic system.

[41:35] Gut bacteria metabolize cellulose, form fatty acids.

[45:02] Living without large intestine; regulation of digestion.

[46:50] CCK stimulates pancreatic juice release, important digestion.

[49:57] Prepare for MCAT and excel with us!

 

Transcript

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0:00.0

Welcome to MCAT Basics, your ultimate guide to the essential topics you need to master for the MCAT,

0:06.2

brought to you by the physicians at med school coach. Every week, Sam Smith breaks down high-yield

0:11.4

MCAT topics, ensuring you're primed for success on test day. Join Sam as we explore the most

0:17.2

crucial subjects outlined by the AAMC pulled from official practice materials and

0:21.8

third-party resources. Get ready to elevate your MCAT game with topics tailored to maximize

0:26.7

your score potential. Hello, I'm Sam Smith. This podcast covers the digestive system. I talk first

0:33.6

about the purpose of the digestive system, then I go into a little bit of anatomy. After that,

0:38.2

I go into a whole lot of physiology, and then lastly, I talk about some of the regulation mechanisms

0:43.7

of the digestive system, being first hormonal regulation, and second, a nervous regulation.

0:50.0

This material will show up on one of the four MCAT sections. That's the BioBiochem section.

0:54.8

It's definitely an important organ system to know for the MCAT.

0:58.2

Is it the most important organ system to know?

1:00.2

Probably not, but it still will show up.

1:02.8

Plus, I think it's a pretty interesting organ system,

1:05.1

and at least I find it really interesting.

1:07.5

And I hope you do as well,

1:08.8

and I hope this podcast helps you in your study.

1:18.1

So in general, the function of the digestive system is to break down nutrients from your diet

1:24.3

into parts that are small enough for your body to then absorb and use for energy

1:28.8

growth, cell repair, and more. For example, when we digest protein, what we're doing is we're

1:34.7

taking these really large proteins and we're breaking them down into individual amino acids or

1:39.7

dipeptides or tripeptides, these really small bits that then can be absorbed into the body,

...

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