Which of the following represents a zygote that will be female?
A. Y
B. XY
C. XX
D. X
Answer: C
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At rest, active sites on the actin are blocked by
A) myosin molecules. B) troponin molecules. C) tropomyosin molecules. D) calcium ions. E) ATP molecules.
The plateau of the cardiac action potential results from the opening of voltage-gated slow ____ channels in the plasma membrane of the ____ cell
a. sodium; contractile b. potassium; autorhythmic c. calcium; contractile d. chloride; pacemaker e. potassium; contractile
These arteries supply 80% of the cerebrum.
A. Internal jugulars B. Internal carotids C. External carotids D. Vertebral
The preganglionic fibers that connect a spinal nerve with an autonomic ganglion in the thoracic and lumbar region of the spinal cord and carries visceral motor fibers that are myelinated form the
A) white rami communicantes. B) gray rami communicantes. C) posterior ramus. D) anterior ramus. E) dermatomes.