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ANAT 100 Module 3 || A Verified A+ Pass.
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What are muscles? correct answers Contractile organs; through muscle contraction, these organs perform a number of important functions What are the three types of muscle? correct answers skeletal, cardiac, smooth Skeletal muscle correct answers Help human body move. Most skeletal muscle is at...

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  • October 18, 2024
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  • 2024/2025
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  • what are muscles

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ANAT 100 Module 3 || A Verified A+ Pass.
What are muscles? correct answers Contractile organs; through muscle contraction, these organs
perform a number of important functions

What are the three types of muscle? correct answers skeletal, cardiac, smooth

Skeletal muscle correct answers Help human body move. Most skeletal muscle is attached to
bones via tendons.

Cardiac muscle correct answers Found in heart. Contract rhythmically, and is modulated by
neural activity and hormones.

Smooth Muscle correct answers controlled by nervous system or hormones. It may be either
generally inactive and then respond to stimulation, or it may be rhythmic.

How can muscles be categorized? correct answers morphology (form) or how they function.

What are the two morphologically categorized groups? correct answers Striated and Smooth
muscle

straited muscle correct answers Striated muscle is marked by both light and dark bands
(striations). Striated muscle is found in heart and skeletal muscles.

How is striated muscle characterized? correct answers Is characterized by long muscle fibres
(cells) with multiple nuclei which are located peripherally for skeletal muscle or centrally for
cardiac muscle. Cardiac muscle also has intercalated discs: connect heart muscle cells to each
other.

Smooth muscle correct answers Found in blood vessels, the digestive system, and other viscera.
Each smooth muscle fibre (cell) contains a single centrally located nucleus. Smooth muscle has
fusiform-shaped (spindle-like) cells without striations.

What are the two functionally categorized groups? correct answers Voluntary & Involuntary

Voluntary Muscle correct answers is consciously controlled in order to perform a specific
function, such as the muscle that move the skeleton for walking, reaching, talking, etc.

What type of muscle is voluntary? correct answers skeletal muscle

involuntary muscle correct answers involuntary muscle is not consciously controlled

What type of muscle(s) is involuntary? correct answers smooth muscle and cardiac muscle

What are the two basic properties of muscle? correct answers excitability and contractility

, Excitability correct answers Ability of muscle tissue to receive and respond to electrical signals
from nerves or stimulation from hormones

Contractility correct answers When a muscle cell is excited by a nerve or hormone, this causes
the muscle to shorten, resulting in contraction.

How many muscles are apart of the skeletal system and what are they composed of? correct
answers 700 named muscles; skeletal muscle tissue, epithelial, connective, and nervous tissue.

What are most skeletal muscles attached to? correct answers Most skeletal muscles are attached
to 2 bones across a joint, such that when contracted, the muscle brings parts of those 2 bones
closer to each other

What are the five functions of skeletal muscle? correct answers Produce movement, maintain
posture and stabilize joints, control excretion (elimination of urine and feces) and swallowing,
produce heat, support and protect internal organs.

What does skeletal muscle consist of? correct answers Skeletal muscle consists of muscle tissue
and connective tissue.

What does connective tissue surround? correct answers Connective tissue surrounds the muscle
tissue and attaches the ends of each muscle to bone.

What are the three layers connective tissue is categorized into? correct answers epimysium,
perimysium, and endomysium

Epimysium correct answers surrounds an entire muscle and is continuous with the tissue that
becomes the tendon.

Perimysium correct answers Layer of connective tissue surrounding a bundle of muscle fibres
(fascicle) within a muscle.

Endomysium correct answers surrounds the individual muscle cells (muscle fibres) within a
muscle bundle

What are the units of contraction for the muscle cell? correct answers myofilaments

What are myofilaments organized into? correct answers repeating structural units known as
sarcomeres

What happens when the sarcomeres are shortened. correct answers Contraction of muscle.

What does each unit consist of? correct answers actin (thin) and myosin (thick)

Why does skeletal muscle have a striated appearance? correct answers due to arrangement of
actin and myosin into organized sarcomeres that form distinct lines and bands.

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