Domanda del libro di testo
Identify the structures in the following figure.
a. ___
b. ___
c. ___
d. ___
e. ___
f. ___
g. ___
h. ___
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Ch. 10 Muscle Tissue
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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TOC.tableOfContents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Capitolo 10, Problema 8
An action potential can travel quickly from one cardiac muscle cell to another because of the presence of
(a) Gap junctions
(b) Tight junctions
(c) Intercalated discs
(d) Both a and c
Guida verificata passo dopo passo1
Step 1: Understand the structure of cardiac muscle cells and how they connect to each other. Cardiac muscle cells are connected by specialized structures that allow electrical signals to pass rapidly between cells.
Step 2: Identify the role of gap junctions. Gap junctions are channels that directly connect the cytoplasm of adjacent cells, allowing ions and small molecules to pass freely, which facilitates the rapid spread of action potentials.
Step 3: Recognize the function of intercalated discs. Intercalated discs are complex structures that include gap junctions and desmosomes; they physically and electrically connect cardiac muscle cells.
Step 4: Differentiate tight junctions from gap junctions. Tight junctions create a seal between cells to prevent leakage of extracellular fluid, but they do not facilitate electrical conduction.
Step 5: Conclude that the rapid transmission of action potentials in cardiac muscle cells is due to both gap junctions and intercalated discs working together, making option (d) the correct choice.
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Action Potential in Cardiac Muscle
An action potential is an electrical signal that triggers muscle contraction. In cardiac muscle, it propagates rapidly to ensure coordinated heartbeats, enabling the heart to pump blood efficiently.
Video consigliato:
3:38
Cardiac Action Potentials Example 3
Gap Junctions
Gap junctions are specialized connections between cardiac muscle cells that allow direct electrical communication. They enable ions and small molecules to pass quickly, facilitating rapid transmission of action potentials.
Video consigliato:
Percorso guidato
05:33Cell Junctions
Intercalated Discs
Intercalated discs are complex structures that connect cardiac muscle cells. They contain gap junctions and desmosomes, providing both mechanical strength and electrical connectivity for synchronized contraction.
Video consigliato:
6:01Structure of the Sarcomere: Bands, Zones, Discs & Lines
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