BIOL 325 Physiology Name Section Homework #8. Skeletal and Cardiac Muscle Instru

Question

BIOL 325 Physiology Name Section Homework #8. Skeletal and Cardiac Muscle Instructions. You may print out the homework and write in the answers. 1. (8 pts) Excitable cell function. Use the terms below to fill in this chart Neurons Skeletal myocyteCardiac myocyte Cardiac pacemaker Cells List the channel types in the plasma membrane that open in response to depolarization List the channel types that are opening and closing to promote repolarization. What is a primary role for calcium in this cell type? How is Ca" released from intracellular stores? Place the following terms in the boxes above exocytosis of neurotransmitter, removing tropomyosin block of actin (2x), depolarization (2x), prolonged absolute refractory period, mechanical activation by membrane depolarization, activation of Ca release channels by Ca2', Na' (3x), Ca (3x), K' (4x), K opening (4x), Na closing (2x), Ca? closing (3x) (7atsl Muscle Cell Comparison Match the letter term(s) below to fil in the blanks

Explanation / Answer

--list of the channels in plasma membrane that open in response to depolarization in skeletal myocytes is ca++ channel open, in cardiac myocytes is na++ channel open. --list the channel types that opening and closing to promote repolarization in skeletal myocytes is na+ channel close and k+channel open, and in cardiac myocytes is closure of ca+2 channel and k+ channel open. --primary role for calcium in skeletal myocytes is removing tropomysin block of actin and in cardiac myoctes activation of ca release by ca+2. -- calcium released from intracellular stores in skeletal myocytes are by exocytosis of neurotransmitter and in cardiac myocytes is depolarization.

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