A positive feedback loop is necessary in which of the following situations?
A. Blood pressure
B. Coughing
C. Bleeding
D. Childbirth
Answer: D
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When a muscle undergoes atrophy in response to disuse
A. the size of actin and myosin filaments decreases. B. the muscle swells. C. capillaries and vessels rupture. D. motor neurons grow and invade abnormally.
This layer is composed of a high concentration of collagen fibers.
A) stratum corneum B) stratum granulosum C) dermis D) hypodermis E) cornified region
Match each term with the appropriate description.
1. lipophobic molecule that interacts with receptors on cell surface 2. site of vasopressin synthesis 3. true endocrine gland of epithelial origin 4. cannot be stored in secretory vesicles 5. derivatives of tyrosine 6. storage and release site for oxytocin A. peptide hormone B. steroid hormone C. amino acid-derived hormone D. anterior pituitary E. hypothalamus F. posterior pituitary
Which of the following statements accurately represents labile cells?
A. Labile cells are eliminated from the body after birth of the fetus. B. Labile cells are only found in the hemopoietic tissue of red bone marrow. C. Labile cells are important to the body, providing a source for new cells to replace those that are damaged. D. Labile cells, such as neurons, have a very limited ability to divide.