Muscular System CH 8 Q1
The main effect of strength training is muscle atrophy
False
Intercalated disks are found in ___ muscle.
cardiac
usually the nonmoving attachment point of a muscle
origin
another name for smooth muscle
visceral muscle
The basic functional unit of a skeletal muscle is a myofilament.
False
When a muscle cannot be supplied with enough oxygen, lactic acid is used to produce ATP.
False
When a person picks up a 5-pound weight, muscle cells contract less forcefully than when a persons pick up a 20-pound weight.
False
Lifting a book off the desk is an example of what type of contraction?
Isotonic
If the muscle of a weightlifter and a marathon runner were compared, the marathon runner would have
more mitochondria in each muscle cell
Muscle tone maintains posture.
True
The production of lactic acid is a result of energy release without a sufficient amount of oxygen.
True
The thin myofilaments in a skeletal muscle are composed of actin.
True
structures that separate one sarcomere from another
Z line
protein that makes up the thin myofilament
actin
Endurance training results in
an increase in blood vessels to a muscle
The triceps brachii and the biceps brachii
are antagonsit to each other
The origin of a muscle is the
attachment to the more stationary bone
The insertion of a muscle is the
attachment to the move movable muscle
In he bending of the elbow, the
biceps brachii is the prime mover
During strenous exercise
both a and b (an oxygen can occur and lactic acid can be created in the muscle)
Which type of muscle tissue contains striations?
both a and b (voluntary muscle and caridac muscle)
Another name for a voluntary muscle is ___ muscle.
both a and c (striated and skeletal)
a small fluid filled sac that lies between some tendons and bones
bursae
Another name fro visceral muscle is ___ muscle.
smooth
Which type of muscle is characterized by cells with tapered ends and a single nucleus?
smooth
another term for skeletal muscle
voluntary muscle
Which substances is stored in the muscle's endoplasmic reticulum and then released when a nerve signal stimulates a muscle fiber?
calcium ions
Which type of muscle tissue specializes in contraction or shortening?
(Cardiac, smooth, striated) all of the above.
ATP is produced by muscle contraction.
False
Almost all of the ATP energy is use in muscle contraction is released in the form of heat.
False
Both cardiac muscle and skeletal muscles have intercalated disks.
False
Which of the following does not happen when a muscle contracts?
The muscle cells partially contracts based on the amount of resistance
usually the moving attachment point of a muscle
insertion
structures that are found only in cardiac muscle
intercalated disks
Muscle hypertrophy
is an increase in muscle size
Strength training causes
muscle hypertrophy
protein that makes up the thick myofilament
myosin
Which of the following is not a primary function of the muscular system?
protection of internal organs not protected by bone
functional unit of a contraction of a skeletal muscle
sarcomere
