Cardiac Muscle - Physiology | Biology+

Course

Other

Study Pack

Set 1: Principles of Cell Function

Set 2: Homeostasis of Body Fluids

Set 3: Signal Transduction, membrane Receptors, second Messengers, and Regulation of Gene Expression

Set 4: The Nervous System: Introduction to Cells and Systems

Set 5: Generation and Conduction of Action Potentials

Set 6: Synaptic Transmission

Set 7: The Somatosensory System

Set 8: The Special Senses

Set 9: Organization of Motor Function

Set 10: Higher Functions of the Nervous System

Set 11: The Autonomic Nervous System and Its Central Control

Set 12: Skeletal Muscle Physiology

Set 13: Cardiac Muscle

Set 14: Smooth Muscle

Set 15: Overview of Circulation

Set 16: Elements of Cardiac Function

Set 17: Properties of the Vasculature

Set 18: Regulation of the Heart and Vasculature

Set 19: Integrated Control of the Cardiovascular System

Set 20: Structure and Function of the Respiratory System

Set 21: Static Lung and Chest Wall Mechanics

Set 22: Dynamic Lung and Chest Wall Mechanics

Set 23: Ventilation

Set 24: Oxygen and Carbon Dioxide Transport

Set 25: Control of Respiration

Set 26: Non-Physiologic Functions of the Lung: Host Defense and Metabolism

Set 27: Functional Anatomy and General Principles of Regulation in the Gastrointestinal Tract

Set 28: The Cephalic, oral, and Esophageal Phases of the Integrated Response to a Meal

Set 29: The Gastric Phase of the Integrated Response to a Meal

Set 30: The Small Intestinal Phase of the Integrated Response to a Meal

Set 31: The Colonic Phase of the Integrated Response to a Meal

Set 32: Transport and Metabolic Functions of the Liver

Set 33: Elements of Renal Function

Set 34: Solute and Water Transport Along the Nephron: Tubular Function

Set 35: Control of Body Fluid Osmolality and Volume

Set 36: Potassium, calcium, and Phosphate Homeostasis

Set 37: Role of the Kidneys in the Regulation of Acid-Base Balance

Set 38: Introduction to the Endocrine System

Set 39: Hormonal Regulation of Energy Metabolism

Set 40: Hormonal Regulation of Calcium and Phosphate Metabolism

Set 41: The Hypothalamus and Pituitary Gland

Set 42: The Thyroid Gland

Set 43: The Adrenal Glands

Set 44: The Male and Female Reproductive Systems

Set 13 Cardiac Muscle

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Set 13 Cardiac Muscle

(Multiple Choice)

Free

Cardiac muscle cells in the atria are capable of contracting spontaneously because of a spontaneous depolarization that results from:

A)An inward current through a hyperpolarization-activated channel.
B)Cyclic changes in the activity of Na⁺,K⁺-ATPase.
C)Slow leak of Ca⁺⁺ through the dihydropyridine receptor.
D)Cyclic changes in the activity of the sarcolemmal Ca⁺⁺ pump.
E)Cyclic changes in the activity of SERCA.

Answer

(Multiple Choice)

Free

Calsequestrin in cardiac muscle:

A)Acts as a high-affinity Ca⁺⁺ buffer in the cytosol.
B)Acts as a low-affinity Ca⁺⁺ buffer in the SR lumen,near the ryanodine receptor.
C)Promotes Ca⁺⁺ accumulation by the mitochondria.
D)Increases the Ca⁺⁺ affinity of the sarcolemmal Ca⁺⁺ pump.
E)Facilitates myosin binding to the actin thin filament.

Answer

(Multiple Choice)

Free

Relaxation of cardiac muscle typically requires:

A)Myosin light-chain dephosphorylation.
B)Activation of the ryanodine receptor.
C)Ca⁺⁺ uptake by the sarcoplasmic reticulum (SR).
D)Phosphorylation of phospholamban.
E)Activation of the dihydropyridine receptor.

Answer