Which one of the following is the correct sequence of nerves that exit the spinal cord, from superior to inferior?
A) thoracic spinal nerves, cervical spinal nerves, lumbar spinal nerves, sacral spinal nerves
B) cervical spinal nerves, lumbar spinal nerves, thoracic spinal nerves, sacral spinal nerves
C) thoracic spinal nerves, cervical spinal nerves, sacral spinal nerves, lumbar spinal nerves
D) cervical spinal nerves, thoracic spinal nerves, sacral spinal nerves, lumbar spinal nerves
E) cervical spinal nerves, thoracic spinal nerves, lumbar spinal nerves, sacral spinal nerves
E
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The brain floats within the cerebrospinal fluid
Indicate whether this statement is true or false.
Norepinephrine increases calcium permeability in cardiac muscle cells and thus increases the heart's contractility
Indicate whether the statement is true or false
What is a role of calcium ions in the second-messenger cascade involving phospholipase C, diacylglycerol, and inositol triphosphate?
A. It splits and activates G-protein subunits. B. It binds to the endoplasmic reticulum and causes the release of inositol trisphosphate. C. It phosphorylates cell proteins. D. It is the first messenger that binds to the integral membrane protein receptor. E. Along with diacylglycerol, it activates protein kinase C.
In the sodium-hydrogen antiport system,
A. both sodium ions and hydrogen ions are transported into the tubular lumen. B. both sodium ions and hydrogen ions are transported into the tubular cell. C. sodium ions are transported into the cell; hydrogen ions are transported out of the cell. D. sodium ions are transported into the tubular lumen; hydrogen ions are transported into the cell. E. sodium ions are transported out of the cell; hydrogen ions are transported into the cell.