Question

question 5 (mandatory) (0.5 points)
which of the following are characteristics of smooth muscle tissues, making it distinguishable from skeletal and cardiac muscle tissues?
a) long, cylindrical, multinucleate cells
b) branched, striated, and uninucleate cells
c) primarily irregularly arranged collagen fibers; some elastic fibers
d) spindle - shaped cells with central nuclei, no striations

question 6 (mandatory) (0.5 points)
which of the four major epidermal layers is the deepest epidermal layer where there is one row of actively mitotic stem cells?
a) stratum basale
b) stratum corneum
c) stratum spinosum
d) stratum granulosum

Explanation:

Question 5

• Skeletal muscle: long, cylindrical, multinucleate, striated.
• Cardiac muscle: branched, striated, uninucleate.
• Smooth muscle: spindle - shaped, uninucleate (central nucleus), non - striated. Option D matches smooth muscle's characteristics, distinguishing it from skeletal and cardiac.

Question 6

• Stratum basale is the deepest epidermal layer. It contains a single row of actively mitotic stem cells (basal cells) that divide to produce new keratinocytes, which move upward through the epidermal layers. Stratum corneum is the outermost (dead cells), stratum spinosum has spiny - looking cells (not the deepest mitotic layer), and stratum granulosum has cells with granules (not the deepest mitotic layer).

Answer:

D) Spindle - shaped cells with central nuclei, no striations