The protein that acts as a calcium receptor in skeletal muscle is: actin troponi
ID: 85613 • Letter: T
Question
The protein that acts as a calcium receptor in skeletal muscle is: actin troponin dystrophia titin Opening and closing of the heart valves is caused by: gravity breathing pressure gradients valves contracting and relaxing How many electrons are involved in a double covalent bond? one two three four six Which of the following best describes the difference in the way B cells and cytotoxic T cells deal with invaders? B cells confer active immunity; T cells confer passive immunity B cells send out antibodies; T cells do the attacking themselves T cells handle the primary response; B cells handle the secondary response B cells provide the cell-mediated response: T cells provide the humoral response The energy content of lipids: is released by bile salts cannot be dissolved in water and cannot be absorbed is, per gram, twice the energy of carbohydrates is per gram, less than the energy of proteins both B and D The function(s) of the human stomach is/are: stores food mixes food with acid begins digestion of proteins. all of these Which level of structure in proteins is determined only by hydrogen bonds between the atoms of the polypeptide backbone? primary secondary tertiary quarternaryExplanation / Answer
14)B In a relaxed muscle, tropomyosin blocks the attachment site for the myosin crossbridge preventing muscle contractions from occurring. Troponin is attached to the protein tropomyosin. When there is an action potential, calcium channels open in the sarcoplasmic membrane and release calcium into the sarcoplasm. Some of this calcium attaches to troponin, which causes it to change shape, exposing binding sites for myosin (active sites) on the actin filaments. Myosin's binding to actin causes crossbridge formation, and contraction of the muscle begins.
15 c pressure gradients. The pressure differences due to the filling of the atria and ventricles cause the closing and opening of various valves in the heart.
16)D in a covalent bond there is equal sharing of electrons between the two atoms involved in bond formation. Two electrons are required for making one bond. So in a double covalent bond, 4 electrons are needed
17) B cells send antibodies and T cells attack themselves.
The B cell response is non cellular(humoral). Antibodies stimulated by B cells attach to specific antigens and then killing cells like macrophages do the rest of the elimination work. T cells carry out the attack themselves and are responsible for cellular immunity. The attacking cells are called cytotoxic T cells.
Cytotoxic T cells are responsible for cellular immunity
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