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Differentiate between stroke volume and cardiac output. How is cardiac output calculated?
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Ch. 20 The Heart
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 20, Problema 26
What effect does sympathetic stimulation have on the heart? What effect does parasympathetic stimulation have on the heart?
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Step 1: Understand the autonomic nervous system's role in regulating heart function. The sympathetic and parasympathetic divisions have opposite effects on the heart to maintain homeostasis.
Step 2: Recognize that sympathetic stimulation increases heart rate and force of contraction. This occurs because sympathetic nerves release norepinephrine, which binds to beta-1 adrenergic receptors on cardiac muscle cells.
Step 3: Note that sympathetic stimulation also increases the speed of electrical conduction through the heart, particularly at the sinoatrial (SA) node and atrioventricular (AV) node, leading to a faster heartbeat.
Step 4: Understand that parasympathetic stimulation decreases heart rate by releasing acetylcholine, which acts on muscarinic receptors in the SA and AV nodes, slowing the rate of depolarization and conduction.
Step 5: Summarize that parasympathetic stimulation primarily reduces heart rate without significantly affecting the force of contraction, promoting a state of rest and energy conservation.
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Sympathetic Nervous System and Cardiac Function
The sympathetic nervous system increases heart rate and force of contraction by releasing norepinephrine, which binds to beta-1 adrenergic receptors on cardiac cells. This prepares the body for 'fight or flight' responses by enhancing cardiac output and blood flow to muscles.
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2:52
Function of the Sympathetic Nervous System
Parasympathetic Nervous System and Cardiac Function
The parasympathetic nervous system decreases heart rate by releasing acetylcholine, which acts on muscarinic receptors in the heart, primarily the sinoatrial node. This promotes 'rest and digest' activities by slowing the heart rate and conserving energy.
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1:56Function of the Parasympathetic Nervous System
Autonomic Regulation of Heart Rate
Heart rate is regulated by the balance between sympathetic and parasympathetic inputs to the sinoatrial node. Sympathetic stimulation accelerates heart rate, while parasympathetic stimulation slows it, allowing the body to adapt to varying physiological demands.
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6:13Control of Heart Rate
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