BIO 264 EXAM 3 ACTUAL PAPER SOLVED
QUESTIONS
◉ Functions of muscle tissue: Pumping blood
Answer: Blood moves through the blood vessels because our
heart tirelessly receives blood and delivers it to all body tissues
and organs.
◉ Properties of muscle tissue: Contractility
Answer: the ability of muscle cells to forcefully shorten. For
instance, in order to flex (decrease the angle of a joint) your elbow
you need to contract (shorten) the biceps brachii and other elbow
flexor muscles in the anterior arm. Notice that in order to extend
your elbow, the posterior arm extensor muscles need to contract.
Thus, muscles can only pull, never push.
◉ Properties of muscle tissue: Excitability
Answer: the ability to respond to a stimulus, which may be
delivered from a motor neuron or a hormone.
◉ Properties of muscle tissue: Extensibility
Answer: the ability of a muscle to be stretched. For instance, let's
reconsider our elbow flexing motion we discussed earlier. In
order to be able to flex the elbow, the elbow extensor muscles
must extend in order to allow flexion to occur. Lack of
extensibility is known as spasticity.
,◉ Properties of muscle tissue: Elasticity
Answer: the ability to recoil or bounce back to the muscle's
original length after being stretched.
◉ All muscle cells share several properties:
Answer: contractility, excitability, extensibility, and elasticity
◉ three types of muscle tissues in the body:
Answer: skeletal muscle, cardiac muscle, and smooth muscle.
◉ Skeletal muscle
Answer: also known as voluntary muscle because we can
consciously, or voluntarily, control it in response to input by nerve
cells. Skeletal muscle, along with cardiac muscle, is also referred
to as striated ("striped") because it has a microscopically streaked
or striped appearance. Skeletal muscle and its associated
connective tissue comprise about 40% of our weight. You may
want to write the following words onto your pillowcase: skeletal,
striated, and voluntary.
◉ Cardiac muscle
Answer: only found in the heart, and although it is striated like
skeletal muscle, it functions involuntarily. Cardiac and most
smooth muscles are autorhythmic-they are capable of contracting
spontaneously without nervous or hormonal stimulation. You may
, want to write these words on the other side of your pillowcase:
cardiac, striated, and involuntary.
◉ Smooth muscle
Answer: is widely distributed throughout the body, being found in
the walls of hollow organs such as our digestive, reproductive, and
urinary tracts, tubes such as blood vessels and airways, and in
other locations, such as the inside of the eye. It gets its name
because it lacks the striped appearance that skeletal and cardiac
muscle display microscopically. Along with cardiac muscle,
smooth muscle is involuntary-not under our conscious control.
Smooth muscle is sometimes known as visceral muscle because it
is a major component of many internal (visceral) organs. You may
want to borrow your roommate's pillow and write visceral,
nonstriated, and involuntary on it.
◉ Word association: Cardiac
Answer: cardiac, striated, and involuntary.
◉ Word association: Smooth Muscle
Answer: visceral, nonstriated, and involuntary
◉ Word association: Skeletal muscle
Answer: skeletal, striated, and voluntary.
◉ How are cardiac and skeletal muscles alike?
QUESTIONS
◉ Functions of muscle tissue: Pumping blood
Answer: Blood moves through the blood vessels because our
heart tirelessly receives blood and delivers it to all body tissues
and organs.
◉ Properties of muscle tissue: Contractility
Answer: the ability of muscle cells to forcefully shorten. For
instance, in order to flex (decrease the angle of a joint) your elbow
you need to contract (shorten) the biceps brachii and other elbow
flexor muscles in the anterior arm. Notice that in order to extend
your elbow, the posterior arm extensor muscles need to contract.
Thus, muscles can only pull, never push.
◉ Properties of muscle tissue: Excitability
Answer: the ability to respond to a stimulus, which may be
delivered from a motor neuron or a hormone.
◉ Properties of muscle tissue: Extensibility
Answer: the ability of a muscle to be stretched. For instance, let's
reconsider our elbow flexing motion we discussed earlier. In
order to be able to flex the elbow, the elbow extensor muscles
must extend in order to allow flexion to occur. Lack of
extensibility is known as spasticity.
,◉ Properties of muscle tissue: Elasticity
Answer: the ability to recoil or bounce back to the muscle's
original length after being stretched.
◉ All muscle cells share several properties:
Answer: contractility, excitability, extensibility, and elasticity
◉ three types of muscle tissues in the body:
Answer: skeletal muscle, cardiac muscle, and smooth muscle.
◉ Skeletal muscle
Answer: also known as voluntary muscle because we can
consciously, or voluntarily, control it in response to input by nerve
cells. Skeletal muscle, along with cardiac muscle, is also referred
to as striated ("striped") because it has a microscopically streaked
or striped appearance. Skeletal muscle and its associated
connective tissue comprise about 40% of our weight. You may
want to write the following words onto your pillowcase: skeletal,
striated, and voluntary.
◉ Cardiac muscle
Answer: only found in the heart, and although it is striated like
skeletal muscle, it functions involuntarily. Cardiac and most
smooth muscles are autorhythmic-they are capable of contracting
spontaneously without nervous or hormonal stimulation. You may
, want to write these words on the other side of your pillowcase:
cardiac, striated, and involuntary.
◉ Smooth muscle
Answer: is widely distributed throughout the body, being found in
the walls of hollow organs such as our digestive, reproductive, and
urinary tracts, tubes such as blood vessels and airways, and in
other locations, such as the inside of the eye. It gets its name
because it lacks the striped appearance that skeletal and cardiac
muscle display microscopically. Along with cardiac muscle,
smooth muscle is involuntary-not under our conscious control.
Smooth muscle is sometimes known as visceral muscle because it
is a major component of many internal (visceral) organs. You may
want to borrow your roommate's pillow and write visceral,
nonstriated, and involuntary on it.
◉ Word association: Cardiac
Answer: cardiac, striated, and involuntary.
◉ Word association: Smooth Muscle
Answer: visceral, nonstriated, and involuntary
◉ Word association: Skeletal muscle
Answer: skeletal, striated, and voluntary.
◉ How are cardiac and skeletal muscles alike?
