Structure, Functions, and Properties of Muscular Tissue

How does cardiac muscle tissue move substances with in the body?

-Cardiac muscles contractions of the heart pump blood through the blood vessels of the body.

The _____________ tissue within the muscle limits the range of extensibility and keeps it within the contractile range of muscle cells.

-Connective tissue

What do the four special properties enable muscular tissue to do?

-Enable muscular tissue to function and contribute to homeostasis

How does skeletal muscle tissue produce body movements?

-Movements of the whole body are a result of muscular contractions that rely in integrated functioning of skeletal muscles, bones, and joints

How does skeletal muscle tissue stabilize body positions?

-Skeletal muscle contractions stabilize joints and help maintain body positions (such standing or sitting) because postural muscles contract continuously.

Which type of muscle tissue is subject to the greatest amount of stretching? (extensibility)

-Smooth muscle tissue

Define Contractility.

-The ability of muscular tissue to contract forcefully when stimulated by an action potential.

Define Elasticity.

-The ability of muscular tissue to return to its original length and shape after contraction or extension.

Define extensibility.

-The ability of muscular tissue to stretch, within limits, without being damaged

Define electrical excitability.

-The ability to respond to certain stimuli by producing electrical signals called action potentials.

Describe what happens when skeletal muscle contract.

-When a skeletal muscle contracts, it generates tension (force of contraction) while pulling on its attachments points.

What are the two main types of stimuli that trigger action potential in muscular tissue? (muscular action potentials)

1. Autorhythmic electrical stimuli ~Arises in muscular tissue in itself and in the hearts pacemaker 2. Chemical stimuli -Neurotransmitters, hormones, or changes in Ph)

OBJECTIVE #1

1. EXPLAIN THE STRUCTURAL DIFFERENCES AMONG THE THREE TYPES OF MUSCULAR TISSUE

What are the four special properties of muscular tissue?

1. Electrical excitability 2. Contractility 3. Extensibility 4. Elasticity

What are the general characteristics of smooth muscle tissue?

1. Nonstriated 2. Involuntary 3. Located primarily in the internal organs

What are the functions of skeletal muscle tissue?

1. Producing body movements 2. Stabilizing body positions 3. Generating heat (thermogenesis)

List the general functions of muscular tissue.

1. Producing movements 2. Stabilizing body positions 3. Storing and moving substances within the body 4. Generating heat (thermogenesis)

What are the general characteristics of skeletal muscle tissue?

1. Striated 2. Voluntary 3. Primarily attached to bones

What are the general characteristics of cardiac muscle tissue?

1. Striated 2. Involuntary 3. Forms the wall of the heart

OBJECTIVE #2

2. COMPARE THE FUNCTIONS AND SPECIAL PROPERTIES OF THE THREE TYPES OF MUSCULAR TISSUE

What are the functions of cardiac muscle tissue?

3. Moves substances within the body

What are the functions of smooth muscle tissue?

3. Storage and moving substances within the body

What are all the ways in which smooth muscle tissue A. Accomplishes storage B. Moves substances throughout the body

A. Sustained contractions of sphincters prevent outflow of contents of a hallow organ ~Food in stomach ~Urine in urinary bladder B. Regulate rate of blood flow of blood vessels by adjusting vessels diameter through contraction or relaxation B. Move food and substances through the GI tract B. Push gametes through passageways of reproductive systems B. Propel urine through urinary systems