Arrange the following steps of muscle fiber contraction in the correct sequence
1. The muscle impulse reaches the sarcoplasmic reticulum and calcium is released.
2. Thin filaments are pulled over the thick filaments.
3.
Calcium floods the sarcoplasm and binds to troponin molecules leaving active sites.
4. The impulse arrives at the synapse and travels through the transverse tubules.
5. The muscle fiber shortens and contracts.
6. Myosin heads bind to exposed active sites on actin, forming cross-bridges.
7-30-2013
A) 4, 1, 3, 2, 6, 5 B) 4, 1, 3, 5, 6, 2
C) 4, 1, 3, 6, 2, 5 D) 4, 3, 6, 2, 5, 1
C
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A. Unmyelinated postganglionic fibers to a spinal nerve B. Myelinated postganglionic fibers to a spinal nerve C. Postganglionic fibers to supply structures of the thorax D. Myelinated preganglionic fibers to a spinal nerve E. Myelinated preganglionic fibers to the sympathetic chain
When viewing a dissected sheep heart, it is easy to discern the right and left ventricles by ________
A) finding the papillary muscles B) tracing where the auricles connect C) locating the apex D) the thickness of the ventricle walls
The glomerulus is part of the renal tubule.
Answer the following statement true (T) or false (F)
Olfactory receptors send axons through the cribriform plate and synapse on neurons in the
A) medulla. B) thalamus. C) cerebral cortex. D) olfactory bulb. E) olfactory tract.