Question

multiple choice question

smooth muscle is named for the fact that it has no _______

nuclei
striations
myoglobin
mitochondria

Explanation:

Identify the defining feature of smooth muscle

Smooth muscle is a type of muscle tissue characterized by its lack of visible microscopic bands or stripes. Unlike skeletal and cardiac muscle, which display alternating light and dark bands under a microscope, smooth muscle cells do not have their contractile proteins organized into highly regular sarcomeres.

Evaluate the given options

• nuclei: Smooth muscle cells contain a single, centrally located nucleus, so they do have nuclei.
• striations: The lack of sarcomere alignment means smooth muscle has no visible striations, giving it a "smooth" appearance under a microscope. This is the reason for its name.
• myoglobin: Smooth muscle contains myoglobin to bind oxygen, although in varying amounts.
• mitochondria: Smooth muscle cells contain mitochondria to generate ATP for contraction.

Answer:

• nuclei
• striations (Correct answer)
• myoglobin
• mitochondria