Proteases and acrosin are enzymes. How do they function in reproduction?
A) They act to break down the protective barriers around the egg, allowing the sperm to penetrate.
B) They direct the sperm to the egg through chemical messengers.
C) They neutralize the mucous secretions of the uterine mucosa.
D) Their function is unknown.
A
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A dog or cat is usually fasted ______ hours prior to surgery
Fill in the blank(s) with correct word
Exposing skeletal muscle fibers to which substance disrupts the cells' troponin-tropomyosin complexes and prevents them from blocking the myosin binding sites on actin?
A) Glycerin B) Calcium C) Acetylcholine D) Sodium
Which papillae, distributed on the anterior two-thirds of the tongue surface, lack taste buds?
A. Fungiform B. Filiform C. Vallate D. Foliate E. Papiform
Which of the following statements does NOT accurately describe aerobic cellular respiration in skeletal muscles?
a) Pyruvic acid generated by glycolysis enters the mitochondria. b) O2 is essential. c) CO2 is produced as a waste product. d) Lactic acid is continually produced. e) Can be used to generate ATP from fats, proteins or carbohydrates.