muscles Flashcards
What type of muscle is responsible for involuntary contractions in the heart?
Cardiac muscle
True or False: Smooth muscle is striated.
False
Fill in the blank: Cardiac muscle cells are connected by _____ to allow synchronized contractions.
intercalated discs
Which type of muscle is found in the walls of hollow organs?
Smooth muscle
What is the primary function of cardiac muscle?
To pump blood throughout the body
True or False: Smooth muscle contractions are typically voluntary.
False
Multiple choice: Which of the following is NOT a characteristic of cardiac muscle? A) Striated B) Multinucleated C) Involuntary D) Intercalated discs
B) Multinucleated
What is the main energy source for cardiac muscle cells?
Adenosine triphosphate (ATP)
Fill in the blank: Smooth muscle can be found in the _____ of blood vessels.
tunica media
What is the contraction mechanism in smooth muscle?
Sliding filament mechanism
True or False: Cardiac muscle can regenerate after injury.
False
What neurotransmitter primarily affects smooth muscle contraction?
Acetylcholine
Multiple choice: Which of the following muscle types has the slowest contraction speed? A) Cardiac B) Smooth C) Skeletal D) None of the above
B) Smooth
What type of muscle is primarily controlled by the autonomic nervous system?
Smooth muscle
Fill in the blank: The heart’s pacemaker is made of _____ tissue.
specialized cardiac muscle
True or False: Cardiac muscle cells can be stimulated by hormones.
True
What is the role of calcium ions in cardiac muscle contraction?
They trigger the contraction process.
Multiple choice: Which form of muscle tissue is responsible for peristalsis? A) Cardiac B) Smooth C) Skeletal D) None of the above
B) Smooth
Fill in the blank: Cardiac muscle has a high density of _____ to support its energy needs.
mitochondria
What is the term for the rhythmic contraction of cardiac muscle?
Heartbeat
True or False: Smooth muscle fibers are arranged in parallel.
False
What type of muscle tissue is primarily involved in voluntary movements?
Skeletal muscle
Fill in the blank: Cardiac muscle is primarily found in the _____ of the body.
heart
What is the primary characteristic that distinguishes smooth muscle from skeletal and cardiac muscle?
Lack of striations
True or False: Cardiac muscle can function without neural stimulation.
True
What role do gap junctions play in cardiac muscle?
They allow electrical signals to pass between cells.
