Which type of muscle tissue is found in the walls of hollow organs and is responsible for involuntary movements?
Cardiac muscle
Smooth muscle
Skeletal muscle
Striated muscle
The Correct Answer is B
A. Cardiac muscle: Cardiac muscle is found only in the heart. It is striated and involuntary with unique intercalated discs and autorhythmicity; it is not the muscle that lines most hollow organs (like intestines, bladder, blood vessels).
B. Smooth muscle: Smooth muscle is non-striated, involuntary muscle located in the walls of hollow organs (e.g., gastrointestinal tract, bladder, uterus), blood vessel walls, and bronchi. It generates slow, sustained contractions for peristalsis, vasomotion, and other automatic functions.
C. Skeletal muscle: Skeletal muscle is striated and under voluntary control, attached to bones to produce movement; it is not the primary muscle of hollow organ walls.
D. Striated muscle: “Striated muscle” is a descriptive term that includes skeletal and cardiac muscle (both have striations). Since the question asks specifically about involuntary muscle in hollow organs, striated muscle is not the correct category.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Flat bone; protection of thoracic organs: Ribs are classified as flat bones (thin, flattened, often slightly curved) and their major functions include protecting thoracic organs (heart and lungs) and providing attachment sites for muscles involved in respiration and trunk movement.
B. Irregular bone; varied functions:Irregular bones (e.g., vertebrae, some facial bones) have complex shapes and varied functions; ribs are not irregular bones.
C. Short bone; stability and support:Short bones (e.g., carpals and tarsals) are roughly cube-shaped and provide stability with limited motion; ribs are not short bones.
D. Long bone; support and leverage:Long bones (e.g., femur, humerus) are longer than they are wide and function mainly in support and leverage for movement; ribs are not long bones.
Correct Answer is A
Explanation
A. Optic nerve:The Optic nerve (CN II) is a purely sensory nerve. It connects the retina to the brain, transmitting the electrical impulses generated by light so the visual cortex can interpret them as images.
B. Facial nerve:The Facial nerve (CN VII) is a mixed nerve primarily involved in motor control of facial expressions and sensory taste perception on the anterior tongue.
C. Trochlear nerve:The Trochlear nerve (CN IV) is a motor nerve. It controls the superior oblique muscle of the eye, aiding in looking downward and inward, but does not transmit visual data.
D. Olfactory nerve:The Olfactory nerve (CN I) is the sensory nerve responsible for the sense of smell.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.