The phrenic nerves arise from the
A) cervical plexuses. B) sacral plexuses.
C) brachial plexuses. D) lumbar plexuses.
A
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Which of the following statements concerning cross bridges is not correct? Cross bridges
a. cross bridges bind to actin during muscle contraction. b. cross bridges are formed by the globular heads of the myosin molecules. c. formation is tied to Cl- levels in the cytosol d. cross bridges bend during muscle contraction. e. cross bridges protrude from the thick filaments.
Which statement best describes a secondary spermatocyte?
A) It is a haploid gamete. B) It undergoes meiosis II. C) It undergoes meiosis I. D) It is a stem cell.
If a cell has ?1 adrenergic receptors, it is sensitive to ________
A) alpha adrenaline B) acetylcholine (ACh) C) norepinephrine (NE) D) nicotine E) adrenaline
The ________ cuff is a structure formed by the tendons of the subscapularis, supraspinatus, infraspinatus, and teres minor muscles.
Fill in the blank(s) with the appropriate word(s).