Some endocrine tumors secrete a hormone that leads to elevation of extracellular fluid Ca21 concentrations. How might this affect cardiac muscle?
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Q: Which of both skeletal and smooth muscle is trig-gered by an increase in cytosolic Ca2+.
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A: Hi, Thanks For Your Question. Answer : Correct Option Is C (stimulates smooth muscle contraction).
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Q: Skeletal Muscle Smooth Muscle Cardiac Muscle Striated? [a] [b] [c] [f] # of Cells? [d] [e] Shape?…
A: Tissue comprises of structurally and functionally similar cells. It is a level of organization in…
Q: What stores CA+ in the muscle cells and what stores CA+ as a reservoir in the human body?
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A: In the human body, there are three types of muscles, skeletal muscles, cardiac muscles, and smooth…
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Q: What about extracellular Ca21 in excitation-contraction coupling?
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Q: Where does Ca2+ for contraction come from
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Q: When voltage-dependent calcium channels open, calcium moves out of the cell
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Q: Which of the following statements about glycolytic fibers is true?
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Q: What happens when excess secretion of ADH occurs? State two causes of this.
A: ADH, commonly referred to as vasopressin is a peptide hormone secreted by the neurohypophysis of the…
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A: The statement A i.e. It is activated by phosphorylation by an active phosphorylase kinase is TRUE.
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Q: What do you mean by actin myofilaments?
A: Myofilaments are threadlike structures. They comprise the myofibrils inside the muscle cells. There…
Q: Mr. White has cerebral palsy and suffers severe muscle spasms as a result of his condition. He is…
A: Muscles are tissues that are capable of contracting and relaxing. Muscle contraction is necessary…
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A: Muscle contains muscle fiber cells which are specialized for contraction. Based on location,…
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Q: In smooth muscle cells, acetylcholine stimulates activation of the enzyme ________, which cleaves…
A: Acetylcholine (ACh) is an organic chemical that functions in the brain and body of many types of…
Q: ne calcium binding protein in muscle is called:
A: Actin protein: It is found both in cytoplasm and in cell nucleus. Actin is highly abundant…
Q: During muscle contraction, calcium ions are released by the
A: During muscle contraction, the calcium ions are released by the sarcoplasmic reticulum.
Q: Explain the concept of the following in regard to muscle cells: power stroke does not need to be a…
A: The process of muscle contraction is initiated when calcium ions bind to troponin protein complex.…
Q: What would happen to the calcium transient following sympathetic stimulation? How are the transport…
A: The autonomic nervous system consists of two main divisions; sympathetic and parasympathetic…
Q: Calmodulin is found in smooth muscle cells and performs a similar function to troponin in striated…
A: Smooth muscle is found in the walls of hollow organs like your intestines and stomach. They work…
Some endocrine tumors secrete a hormone that leads to elevation of extracellular fluid Ca21 concentrations. How might this affect cardiac muscle?
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- Compare and contrast the effects of glucagon and epinephrine on metabolic pathways in their target tissues. Keep in mind that skeletal muscle lacks cell surface receptors for glucagon.The phases and ionic basis of an action potential. Membrane potential (mv) +30 -55 -70 Na* channels open + K Action potential -Pha channels open .PK Time (msec) (b) Permeability changes for Na* and K* during an action potential Membrane permeability (P)PDGF is encoded by a gene that can cause cancer when expressed inappropriately. why do cancers not arise at wounds in which PDGF is released from platelets?
- "Motor neurons trigger action potentials in muscle cell membranes that open voltage-sensitive Ca2+ channels in T tubules, allowing extracellular Ca2+ to enter the cytosol, bind to troponin C, and initiate rapid muscle contraction", is true or false.Gap junctions between cardiac muscle cells and gap junctions between uterine smooth muscle cells form connections that provide for rapid communication. What is this phenomenon called?Give THREE main classes of proteins that mediate the time course of Ca2+-elevation in neurons.
- Briefly describe one voltage-gated ion channel and two protein pumps found in the heart. In your answer, you should explain how the voltage-gated ion channel responds to voltage changes and how it controls which ions pass through the channel. For the protein pumps, be sure to describe the structure of the protein pump and any conformational changes that it goes through. Additionally, you should briefly explain the importance of each ion channel or pump for the normal functioning of the cardiac muscle.taw a graph representing the changes in membrane potential across the axonal membrane before, during, and after an action potential, On your graph, use a highlighter to clearly indicate for which portions of your graph the letter corresponding to each cellular event listed below belongs. List of cellular events: A) All K* channels open B) All Nat channels close C) The Na*/K* ATPase cotransporter transports Nat and K* across the membrane. D) All Na* channels open E) The threshold value of membrane potential is attained. F) All K* channels close G) Some Nat channels open Your graph: o pe cffectonDescribe the steps of TH1 activation in 2 to 3 paragraphs
- A rise in the intracellular Ca2+ concentration causes muscle cells to contract. In addition to an ATPdriven Ca2+-pump, heart muscle cells, which contract quickly and regularly, have an antiporter that exchanges Ca2+ for extracellular Na+ across the plasma membrane. This antiporter rapidly pumps most of the entering Ca2+ ions back out of the cell, allowing the cell to relax. Ouabain, a drug that is used in the treatment of patient with heart disease, make the heart contract more strongly. The drug functions by partially inhibiting the Na+-K+ pump in the membrane of the heart muscle cell. What will happen if too much of the drug is taken?When the neurotransmitter acetylcholine (ACh) binds the acetylcholine receptor (a GPCR) on muscle cells, it causes them to contract. ZIGGY, a chemical analog of ACh, also binds to the same acetylcholine receptor on muscle cells, but instead causes the muscle cells to relax. For this reason, it is sometimes prescribed as a muscle relaxer. Explain in 3-4 sentences how ZIGGY could cause muscle relaxation. How can both ZIGGY and ACh bind the same GPCR? And then how can they have different effects on the cells, despite binding to the same receptor on the same cells?TSC acts as a tumor suppressor by continually suppressing mTOR and must be inhibited in order for mTOR to be active. True or false, explain why