Proteins

Proteins are large, complex molecules that play many critical roles in the body. They are made up of long chains of amino acids, which are the building blocks of proteins. There are 20 different types of amino acids that can be combined in various ways to form a wide variety of proteins.

Functions of Proteins

Proteins have many important functions in the body, including:

• Enzymes: Many proteins act as enzymes, which are molecules that facilitate chemical reactions in the body.
• Structural support: Proteins such as collagen provide structural support for tissues and organs.
• Transport: Some proteins, like hemoglobin, help transport molecules such as oxygen in the blood.
• Immune function: Antibodies are proteins that play a key role in the immune system.
• Hormones: Some proteins, like insulin, act as hormones that regulate various bodily functions.
• Cellular communication: Proteins can serve as signaling molecules that help cells communicate with each other.

Sources of Proteins

Proteins are found in a variety of foods, including:

• Meat and poultry
• Fish and seafood
• Dairy products
• Eggs
• Legumes (beans, lentils, peanuts)
• Nuts and seeds
• Tofu and other soy products

Study Guide

Here are some key points to remember about proteins:

1. What are proteins made of?
2. What are the functions of proteins in the body?
3. What are some dietary sources of proteins?
4. How many different types of amino acids are there?
5. What is the role of enzymes in the body?