Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Endomembrane System: Protein Secretion

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Endomembrane System: Protein Secretion

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0:28 minutes

Problem 6

Textbook Question

Cells that line your intestines are known to possess a large number of membrane proteins that transport small molecules and ions across the plasma membrane. Which of the following cell structures would you expect to be required for this characteristic of the cells?a. the endoplasmic reticulumb. peroxisomesc. lysosomesd. the cell wall

Verified step by step guidance

Identify the function of each cell structure listed in the options.

Understand that membrane proteins are synthesized and processed in specific organelles.

Recall that the endoplasmic reticulum (ER) is involved in the synthesis of proteins, especially those that are membrane-bound or secreted.

Consider that peroxisomes and lysosomes are involved in different cellular processes, such as detoxification and digestion, respectively, and are not directly related to protein synthesis for the plasma membrane.

Recognize that the cell wall is not present in animal cells and is not involved in the synthesis or transport of membrane proteins.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Membrane Proteins

Membrane proteins are integral or peripheral proteins that reside within or on the surface of the cell membrane. They play crucial roles in transporting molecules and ions across the plasma membrane, facilitating communication and signaling between the cell and its environment. In intestinal cells, these proteins are essential for nutrient absorption and maintaining homeostasis.

Plasma Membrane

The plasma membrane is a selective barrier that surrounds the cell, composed of a phospholipid bilayer with embedded proteins. It regulates the entry and exit of substances, allowing essential nutrients to enter while keeping harmful substances out. Understanding its structure and function is vital for comprehending how cells transport molecules and ions.

Endoplasmic Reticulum (ER)

The endoplasmic reticulum (ER) is an organelle involved in the synthesis and transport of proteins and lipids. The rough ER, studded with ribosomes, is particularly important for producing membrane proteins, which are crucial for the function of intestinal cells. The ER's role in protein processing and transport is essential for maintaining the functionality of membrane proteins involved in nutrient transport.