Domanda del libro di testo
The heart is surrounded by the:
(a) Pleural cavity
(b) Peritoneal cavity
(c) Abdominopelvic cavity
(d) Mediastinum
(e) Abdominal cavity
550
views
Ch. 20 The Heart
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
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 20, Problema 6
The cardiac skeleton of the heart has which two of the following functions?
(a) It physically isolates the muscle fibers of the atria from those of the ventricles.
(b) It maintains the normal shape of the heart.
(c) It helps distribute the forces of cardiac contraction.
(d) It allows more rapid contraction of the ventricles.
(e) It strengthens and helps prevent overexpansion of the heart.
Guida verificata passo dopo passo1
Step 1: Understand the cardiac skeleton's anatomical role. The cardiac skeleton is a dense connective tissue structure located between the atria and ventricles of the heart.
Step 2: Recognize that one of its primary functions is to physically separate the atrial muscle fibers from the ventricular muscle fibers, which helps prevent unwanted electrical conduction between these chambers. This corresponds to option (a).
Step 3: Consider the structural support role of the cardiac skeleton. It provides a framework that maintains the shape of the heart and anchors the heart valves, contributing to the heart's mechanical stability. This relates to options (b) and (e).
Step 4: Evaluate the options related to electrical conduction and contraction speed. The cardiac skeleton does not facilitate more rapid contraction of the ventricles (option d), nor is its main role to distribute contraction forces (option c), although it indirectly supports force transmission by providing structural integrity.
Step 5: Conclude that the two main functions of the cardiac skeleton are (a) physically isolating atrial and ventricular muscle fibers to control electrical conduction, and (e) strengthening and preventing overexpansion of the heart by providing structural support.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Concetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Cardiac Skeleton Structure and Composition
The cardiac skeleton is a dense connective tissue framework within the heart that provides structural support. It surrounds the heart valves and separates the atria from the ventricles, forming a fibrous ring that anchors valve leaflets and muscle fibers.
Video consigliato:
9:44
Events in the Cardiac Cycle
Electrical Isolation Between Atria and Ventricles
One key function of the cardiac skeleton is to electrically isolate the atrial muscle fibers from the ventricular muscle fibers. This prevents direct electrical conduction between chambers, ensuring that impulses pass only through the atrioventricular node, coordinating proper heart rhythm.
Video consigliato:
3:42Electrical Conduction System of the Heart Example 2
Mechanical Support and Force Distribution
The cardiac skeleton maintains the shape of the heart and provides mechanical support by distributing the forces generated during cardiac contraction. This prevents overexpansion and helps maintain the integrity of the heart valves and chambers during the cardiac cycle.
Video consigliato:
3:43Support Structures
Pratica correlata
Domanda del libro di testo
The simple squamous epithelium covering the heart valves is the:
(a) Epicardium
(b) Endocardium
(c) Myocardium
(d) Endothelium
1043
views
Domanda del libro di testo
The serous membrane covering the outer surface of the heart is the:
(a) Parietal layer of the serous pericardium
(b) Endocardium
(c) Myocardium
(d) Visceral layer of the serous pericardium
1539
views
1
rank
Domanda del libro di testo
Identify the structures in the following diagram of a sectional view of the heart.
a. ___
b. ___
c. ___
d. ___
e. ___
f. ___
g. ___
h. ___
i. ___
j. ___
k. ___
l. ___
m. ___
885
views
Domanda del libro di testo
Identify the superficial structures in the following diagram of the heart.
a. ___
b. ___
c. ___
d. ___
e. ___
f. ___
g. ___
h. ___
783
views
Domanda del libro di testo
Cardiac output is equal to the:
(a) Difference between the end-diastolic volume and the end-systolic volume
(b) Product of heart rate and stroke volume
(c) Difference between the stroke volume at rest and the stroke volume during exercise
(d) Stroke volume less the end-systolic volume
(e) Product of heart rate and blood pressure
1164
views