Skeletal muscle fibers
A. possess striations.
B. can contract but are not extensible or excitable.
C. do not require nerve innervation to contract.
D. increase dramatically in number after birth.
E. are found in the walls of the stomach.
A
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__________ of a population occurs when environmental stressors favor survival of certain genotypes, leading to their increased levels of reproduction
Fill in the blank with correct word
Which cell type in the epidermis produces a pigment that absorbs ultraviolet light?
a. keratinocyte b. melanocyte c. Langerhans cell d. Granstein cell e. sebaceous cell
Why is the trachea supported by C-shaped cartilage rings instead of O-shaped (complete rings)?
A. To allow the esophagus to expand when swallowing B. To produce sound as air passes through C. To control the pitch of the voice D. To hold it open all the time
As seen on coronal images, the lateral walls of the third ventricle are formed by the hypothalamus.
Answer the following statement true (T) or false (F)