Skip to main content
Ch. 10 Muscle Tissue
Martini - Fundamentals of Anatomy & Physiology 11th Edition
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Martini, Nath, Bartholomew 11th EditionCh. 10 Muscle Tissue문제 8
10장, 문제 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

검증된 단계별 안내
1
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.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
3m
도움이 되었나요?

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

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.
추천 영상:
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.
추천 영상:
가이드 코스
05:33
Cell 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.
추천 영상:
6:01
Structure of the Sarcomere: Bands, Zones, Discs & Lines
관련 실천
교과서 질문

Identify the structures in the following figure.

a. ___

b. ___

c. ___

d. ___

e. ___

f. ___

g. ___

h. ___

878
views
교과서 질문

What forms of energy reserves do resting skeletal muscle fibers contain?

825
views
교과서 질문

Which of the following statements about myofibrils is not correct?

(a) Each skeletal muscle fiber contains hundreds to thousands of myofibrils.

(b) Myofibrils contain repeating units called sarcomeres.

(c) Myofibrils extend the length of a skeletal muscle fiber.

(d) Filaments consist of bundles of myofibrils.

(e) Myofibrils are attached to the plasma membrane at both ends of a muscle fiber.

801
views
교과서 질문

What structural feature of a skeletal muscle fiber propagates action potentials into the interior of the cell?

824
views
교과서 질문

What three layers of connective tissue are part of each muscle? What functional role does each layer play?

873
views