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

Introduction to Eukaryotic Organelles

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Eukaryotic Organelles

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which eukaryotic organelle is described as a membranous channel extending inward from the muscle fiber membrane and plays a key role in transmitting action potentials?

Sarcoplasmic reticulum

Golgi apparatus

Mitochondrion

Transverse (T) tubule

Previous problemNext problem

Verified step by step guidance

Understand the problem: The question asks about a eukaryotic organelle that is a membranous channel extending inward from the muscle fiber membrane and is involved in transmitting action potentials. This is a structural and functional question related to muscle physiology.

Clarify the role of each option: The sarcoplasmic reticulum stores and releases calcium ions during muscle contraction. The Golgi apparatus is involved in packaging and transporting proteins, not muscle contraction. The mitochondrion is responsible for energy production (ATP synthesis) but does not transmit action potentials.

Focus on the correct answer: The transverse (T) tubule is a membranous channel that invaginates from the sarcolemma (muscle fiber membrane) into the muscle cell. It plays a critical role in transmitting action potentials deep into the muscle fiber to ensure synchronized contraction.

Explain the mechanism: When an action potential travels along the sarcolemma, it enters the T-tubules. This allows the signal to reach the sarcoplasmic reticulum, triggering calcium release and initiating muscle contraction.

Summarize the key concept: The transverse (T) tubule is essential for efficient communication between the muscle fiber membrane and the interior of the muscle cell, ensuring proper contraction during excitation-contraction coupling.