Podcast
Questions and Answers
Which muscle type is characterized by voluntary control and attachment to the skeleton?
Which muscle type is characterized by voluntary control and attachment to the skeleton?
- Visceral muscle
- Cardiac muscle
- Smooth muscle
- Skeletal muscle (correct)
Which type of muscle lacks striations and is found in the walls of blood vessels?
Which type of muscle lacks striations and is found in the walls of blood vessels?
- Striated muscle
- Smooth muscle (correct)
- Skeletal muscle
- Cardiac muscle
What distinguishes cardiac muscle from skeletal muscle regarding nerve supply?
What distinguishes cardiac muscle from skeletal muscle regarding nerve supply?
- Cardiac muscle is controlled by the somatic nervous system, while skeletal muscle is controlled by the autonomic nervous system.
- Both cardiac and skeletal muscle are controlled by the autonomic nervous system.
- Cardiac muscle is controlled by the autonomic nervous system, while skeletal muscle is controlled by the somatic nervous system. (correct)
- Both cardiac and skeletal muscle are controlled by the somatic nervous system.
What is the approximate percentage of skeletal muscles in relation to the total body mass?
What is the approximate percentage of skeletal muscles in relation to the total body mass?
Which of the following is NOT a primary function of skeletal muscles?
Which of the following is NOT a primary function of skeletal muscles?
What is the main function of the muscles of mastication?
What is the main function of the muscles of mastication?
What is the structural difference between the origin and insertion of a typical skeletal muscle?
What is the structural difference between the origin and insertion of a typical skeletal muscle?
Which of the following characteristics is unique to skeletal muscle cells (fibers)?
Which of the following characteristics is unique to skeletal muscle cells (fibers)?
What functional roles are served by the muscles of the pharynx and larynx?
What functional roles are served by the muscles of the pharynx and larynx?
How does the autonomic nerve supply influence cardiac muscle function?
How does the autonomic nerve supply influence cardiac muscle function?
Which muscle is primarily responsible for rotating the head?
Which muscle is primarily responsible for rotating the head?
Intramuscular injections in the arm are commonly administered in which muscle?
Intramuscular injections in the arm are commonly administered in which muscle?
Which muscle group is located on the back of the thigh?
Which muscle group is located on the back of the thigh?
Which of the following muscles is a frequent site for intramuscular injections in the gluteal region?
Which of the following muscles is a frequent site for intramuscular injections in the gluteal region?
What is the primary function of the intercostal muscles?
What is the primary function of the intercostal muscles?
The diaphragm has major openings for the passage of which structures?
The diaphragm has major openings for the passage of which structures?
Which of the following describes the abdominal muscles' primary role?
Which of the following describes the abdominal muscles' primary role?
In the context of the leg muscles, where is deep venous thrombosis (DVT) most likely to occur?
In the context of the leg muscles, where is deep venous thrombosis (DVT) most likely to occur?
What is the primary function of the pelvic muscles?
What is the primary function of the pelvic muscles?
Flashcards
Skeletal Muscles
Skeletal Muscles
Attached to bones, voluntary contraction, striated, somatic nerve supply, multinucleated cells.
Smooth Muscles
Smooth Muscles
Found in blood vessel walls and organs, involuntary contraction, non-striated, autonomic nerve supply, spindle-shaped cells with one nucleus.
Cardiac Muscles
Cardiac Muscles
In the heart's myocardium, involuntary contraction, striated, autonomic nerve supply, single nucleus cells.
Voluntary Muscle
Voluntary Muscle
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Involuntary Muscle
Involuntary Muscle
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Muscle Origin
Muscle Origin
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Muscle Insertion
Muscle Insertion
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Tendon
Tendon
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Muscles of Facial Expression
Muscles of Facial Expression
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Muscles of Mastication
Muscles of Mastication
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Sternomastoid Muscle
Sternomastoid Muscle
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Deltoid Muscle
Deltoid Muscle
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Pectoralis Major
Pectoralis Major
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Triceps
Triceps
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Biceps
Biceps
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Forearm Flexors
Forearm Flexors
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Forearm Extensors
Forearm Extensors
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Gluteus Maximus
Gluteus Maximus
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Hamstring Muscles
Hamstring Muscles
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Pelvic Muscles
Pelvic Muscles
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Study Notes
- The muscular system consists of cardiac, skeletal, and smooth muscles.
Skeletal Muscles
- Skeletal muscles attach to the skeleton.
- Their contraction is voluntary.
- Striations are present.
- It is supplied by somatic nerves
- Muscle cells are multinucleated.
Smooth Muscles
- Smooth muscles located in the walls of blood vessels and viscera.
- Their contraction is involuntary.
- Striations are absent.
- They are supplied by the autonomic nerve
- Muscle cells are spindle-shaped with a single nucleus.
Cardiac Muscles
- Cardiac muscles are in the myocardium of the heart.
- Their contraction is involuntary.
- Striations are present.
- They are suppled by autonomic nerves
- Muscle cells have a single nucleus.
Skeletal Muscles General Features
- Skeletal muscles form about 40-50% of total body mass.
- Muscles arise from an origin and terminate in an insertion.
- The origin is usually a fleshy mass.
- Insertions are cord-like structures called tendons
Skeletal Muscles Function
- Producing movement
- Maintaining posture
- Stabilizing joints
- Generating heat
Main Muscle Groups of the Body
- Muscles of the head and neck include those for facial expression, mastication, and the tongue, pharynx, and larynx. The Sternomastoid muscle action rotates the head
- Muscles of mastication (grinding food) such as temporalis and masseter
- The deltoid muscle is located in the shoulder
- The site for intramuscular injection is in the deltoid muscle
- Muscles of the arm and chest include the triceps, biceps, and the Pectoralis major
- Flexors and extensors are muscles of the forearm
- Gluteus maximus in the gluteal region a site for intramuscular injection.
- Hamstrings are muscles of the back of the thigh.
- Quadriceps are muscles of the front of the thigh.
- Adductors are thigh muscles on the medial side.
- Calf muscles are located on the leg and are a site of deep venous thrombosis.
- Muscles of the thoracic wall are intercostal muscles used for respiration.
- The anterior abdominal wall muscles protect abdominal contents and allow trunk movements.
- The diaphragm is located between the thoracic and abdominal cavities
- It is the main respiratory muscle attached to the sternum, ribs, and lumbar vertebrae.
- It has 3 major openings for the aorta, inferior vena cava (IVC), and esophagus.
- Muscles of the pelvis attach to hip bones, the sacrum, and the coccyx.
- Pelvic muscles support pelvic viscera and are important for females during labor.
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Description
Explore the muscular system, including cardiac muscles in the heart, skeletal muscles attached to the skeleton, and smooth muscles in blood vessels and viscera. Learn about their voluntary or involuntary contractions, presence or absence of striations and nerve supply. Understand the general features of skeletal muscles, including origin, insertion, and tendons.
