Explanation A pacemaker is a medical machine that is situated at the top of the heart's right atrium to help control abnormal (or unusual) heart rates. This machine utilizes electrical pulses to imply the heart to beat (or vibrate) at a normal rate. The pacemaker is used to treat arrhythmias. Arrhythmias are the problem with the rhythm or rate of the heartbeat. The natural pacemaker of the heart is SA node...

Connect with LearnSmart Labs for Lab Manual for Human Anatomy & Physiology

4th Edition

ISBN: 9781260159233

Author: Terry Martin, Cynthia Prentice-Craver

Publisher: Mcgraw-hill Higher Education (us)

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Ovarian and Uterine Cycles

Two cycles are engaged with the guideline of a lady's richness: the ovarian cycle and the uterine cycle (additionally called the period). The ovarian cycle is a cycle that controls a lady's fruitfulness. The ovary of the follicle that produces an egg eve…

Structure and Function of The Vertebral Column

The vertebral column (also known as the backbone or spine) is a tall, thin bone that runs from the base of the spine to the pelvis and is located dorsally. It protects the spinal cord and serves as a vital connection point for a variety of muscle groups.

Axial Versus Appendicular Muscles

Axial muscle is one of the skeletal muscles that are found in the trunk and the head regions of the human body. They include the muscles of the tail and eyeball too. Axial muscles are originated from the axial skeleton that composes the bones in the neck…

Motor Units In Skeletal Muscles

A motor unit is a functional unit of muscle contraction and each muscle in the body includes many motor units. It consists of alpha motor neurons, axons, and muscle fibers. Each motor neuron comes from the anterior horn of the spinal cord and supplies ne…

Muscle And Nervous Tissues

A tissue is a group of similar cells that are organized to perform one or more specific functions. Tissues are classified into four different types based on their morphology and function: connective tissue, nervous tissue, muscle tissue, and epithelial t…

Gastroileal Reflex

Gastroileal reflex is a reflexstimulated by the opening of the ileocecal valve, pushing the digested material from the ileum present in the small intestine to the large intestineaccompanied by a desire to defecate. It is the third type of gastrointestina…

Synaptic Knob

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Blood Vessels Of The Head And Neck

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Suspensory Ligament

A suspensory ligament is a group of fibrous membranes or any tissues that puts up or suspends a particular organ or a part of the body.

Receptive Relaxation

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Circulatory System

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Human Excretory System

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Nail Structure And Function

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Hair Structure And Function

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Muscular System

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Muscular System Disorders

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Human Body Systems

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Human Reproductive System

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Sexual Reproduction

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Respiratory System

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Digestive System

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The human body consists of several systems that help it to perform several essential life processes. The digestive system and the excretory system are some of the many systems that make the human body fit to its environment.

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The hormones are generated in the body for controlling various biochemical reactions, which are concerned with the maintenance of homeostasis. The hormones regulate the physiological and behavioral processes of the body. The reactions including respirati…

Temporal Summation

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Question

Chapter 45, Problem 3.1A

Summary Introduction

To fill:

The correct term in the given blank.

Introduction:

In most animals, the heart is a muscular organ which pumps blood via circulatory system throughout the body. Blood gives oxygen and nutrients to the body, and removes metabolic wastes. The heart is placed just behind and moderately left of the sternum (breastbone) in humans.

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Chapter 45, Problem 2.2A

Chapter 45, Problem 3.2A

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Chapter 45 Solutions

Connect with LearnSmart Labs for Lab Manual for Human Anatomy & Physiology

Ch. 45 - The _______ of the conduction system is known as...Ch. 45 - The ________ of the conduction system is/are...Ch. 45 - The first of two heart sounds (lubb) occurs when...Ch. 45 - One cardiac cycle would consist of a. left chamber...Ch. 45 - The SA node of the heart is located in the a....Ch. 45 - The depolarization of ventricular fibers is...Ch. 45 - The dupp sound occurs when the semilunar valves...Ch. 45 - The P wave of an ECG occurs during the...Ch. 45 - The period during a heart is contracting is called...Ch. 45 - The period during which a heart chamber is...

Ch. 45 - During ventricular contraction, the AV valves...Ch. 45 - During ventricular relaxation, the AV valves are...Ch. 45 - The pulmonary and aortic valves open when the...Ch. 45 - The first sound of a cardiac cycle occurs when the...Ch. 45 - The second sound of a cardiac cycle occurs when...Ch. 45 - The sound created when blood leaks back through an...Ch. 45 - What changes did you note in the heart sounds when...Ch. 45 - What changes did you note in the heart sounds...Ch. 45 - Prob. 3.1A Ch. 45 - The ____________________ node is located in the...Ch. 45 - The fibers that carry cardiac impulses from the...Ch. 45 - Prob. 3.4A Ch. 45 - The P wave corresponds to depolarization of the...Ch. 45 - The QRS complex corresponds to depolarization of...Ch. 45 - The T wave corresponds to repolarization of the...Ch. 45 - Why is atrial repolarization not observed in the...Ch. 45 - Identify the heart chambers and conduction system...Ch. 45 - How much time passed from the beginning of the P...Ch. 45 - What is the significance of this P-R interval?Ch. 45 - How can you determine heart rate from an...Ch. 45 - As blood in the ventricles surges back against the...

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Solution Summary: The author explains that the heart is a muscular organ that pumps blood via circulatory system throughout the body. The pacemaker is used to treat arrhythmias.

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