When a catecholamine or peptide hormone binds to receptors on the surface of a cell,
A) a second messenger appears in the cytoplasm.
B) the cell becomes inactive.
C) the hormone is transported to the nucleus where it alters the activity of DNA.
D) the cell membrane becomes less permeable.
E) None of the answers are correct.
A) a second messenger appears in the cytoplasm.
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The linea alba is a muscle of the pelvic floor.
Answer the following statement true (T) or false (F)
Why does the upper third of the esophagus have skeletal muscle in its wall?
A. The first phase of swallowing is involuntary B. So that peristalsis can occur C. To prevent choking D. The first phase of swallowing is voluntary
Labyrinthitis is a medical condition often caused by viral infection, resulting in swelling and inflammation of the membranous labyrinth. Which of the following symptoms would you most associate with the condition of labyrinthitis?
A) auditory hallucination B) loss of hearing C) ringing in the ears (tinnitus) D) loss of balance and dizziness
Blocklike masses that form from paraxial mesoderm and develop into muscle, axial skeleton, cartilage, and dermis are known as ________.
Fill in the blank(s) with the appropriate word(s).