Biology
Biology, 07.10.2019 11:30, raishagibson

There are different types of muscle cells, but heart contractions are caused by a specific type of muscle cell.
a. true
b. false

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Biology, 27.06.2019 21:50, thestarlexyp32wpj
The lab you work in has discovered a previously unidentified extracellular signal molecule called qgf, a 75,000-dalton protein. you add purified qgf to different types of cells to determine its effect on these cells. when you add qgf to heart muscle cells, you observe an increase in cell contraction. when you add it to fibroblasts, they undergo cell division. when you add it to nerve cells, they die. when you add it to glial cells, you do not see any effect on cell division or survival. given these observations, which of the following statements is most likely to be true? and why? (5points)(a) because it acts on so many diverse cell types, qgf probably diffuses across the plasma membrane into the cytoplasm of these cells.(b) glial cells do not have a receptor for qgf.(c) qgf activates different intracellular signaling pathways in heart muscle cells, fibroblasts, and nerve cells to produce the different responses observed.(d) heart muscle cells, fibroblasts, and nerve cells must all have the same receptor for qgf.
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Biology, 04.08.2019 14:30, Calumworthy6046
Complete each sentence below by selecting the type of muscle cell that performs the function described. "" are used to the heart beat and pump blood. "" are used in the digestion of food. "" are involved in movements of the skeleton (bones). terms to use: 1. skeletal muscle cells 2. smooth muscle cells 3. cardiac muscle cells
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Biology, 24.08.2019 00:30, montgomerykarloxc24x
1) muscles are organs composed mainly of muscle fibers. true false 2) muscles appear striated, or striped, because their cells are arranged in sheets. true false 3) involuntary contractions mean they are not under conscious control. true false 4) contractions of skeletal muscle are involuntary. true false
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Medicine, 31.08.2019 04:10, jaallen3679
To support maxium muscle contraction of the heart muscle, the blood flow to the heart is highest during the strongest contractions. a. true b. false
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