Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

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Chapter 20, Problem 6RAC

Summary Introduction

Introduction:

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

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The action potential of skeletal muscle A. is not essential for contraction. B. is longer than the action potential of cardiac muscle. C. has a prolonged plateau phase. D. causes the immediate uptake of calcium ions into the lateral sacs of the sarcoplasmic reticulum. E. spreads inward to all parts of the muscle via the T tubules.

All of the following characteristics apply to skeletal muscle except a. They are striated. b. They are multinucleated. c. They are voluntary. d. They contain intercalated discs. e. They are attached to the skeleton by means of tendons.

Compared with skeletal muscle, visceral smooth musclea. has the same ability to be stretched.b. loses the ability to contract forcefully when stretched.c. maintains about the same tension, even when stretched.d. cannot maintain long, steady contractions.e. can accumulate a substantial oxygen deficit.

Answer 2

Question

Chapter 20, Problem 6RAC

Summary Introduction

Introduction:

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

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Answer 3

Question

Chapter 20, Problem 6RAC

Summary Introduction

Introduction:

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

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Answer 4

Question

Chapter 20, Problem 6RAC

Summary Introduction

Introduction:

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

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Answer 5

Chapter 20, Problem 6RAC

Summary Introduction

Introduction:

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

Answer 6

Chapter 20, Problem 6RAC

Summary Introduction

Introduction:

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

Answer 7

Chapter 20, Problem 6RAC

Summary Introduction

Introduction:

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

Answer 8

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Answer 11

Ch. 20.1 - State the four functions of the heart.Ch. 20.2 - What is the approximate size and shape of the...Ch. 20.2 - Where is the heart located? How does this...Ch. 20.3 - Describe the parts of the pericardium and their...Ch. 20.3 - Describe the three layers of the heart wall, and...Ch. 20.3 - Name the chambers of the heart, and describe their...Ch. 20.3 - List the major blood vessels that enter and leave...Ch. 20.3 - Prob. 8AYP Ch. 20.3 - Prob. 9AYP Ch. 20.3 - Prob. 10AYP

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

Solution Summary: The author explains that the correct answer is option (e). The cardiac muscle has a smooth sarcoplasmic reticulum and transverse tubules.

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Introduction:

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

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Chapter 20 Solutions

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

Solution Summary: The author explains that the correct answer is option (e). The cardiac muscle has a smooth sarcoplasmic reticulum and transverse tubules.

Concept explainers

Videos

Introduction: Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.

Want to see the full answer?

Chapter 20 Solutions

Introduction:

Cardiac muscle is present only in the walls of the heart. It connects at branching, irregular angles, which are known as intercalated discs. The movement of cardiac muscle is involuntary.