The same chemical messenger may be either a hormone or a(n) __________, depending on its source and mode of delivery to the target cell
Fill in the blank(s) with correct word
neurotransmitter
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During early embryonic development, a protein called sonic hedgehog is released from a cell and travels in a small gradient through the interstitial fluid only to nearby cells. This helps to establish the path and direction of development for the nervous system and limbs. Knowing this, sonic hedgehog must be a(n) ________ signal.
A. nervous B. endocrine C. autocrine D. paracrine
The movement of the forearm while twisting a doorknob is
A) protraction and retraction. B) abduction and adduction. C) flexion and extension. D) lateral rotation and medial rotation. E) supination and pronation.
Fingernails and toenails start to form in the ________ week of development.
A. 5th B. 16th C. 2nd D. 3rd E. 10th
Describe the lumbar plexus and sacral plexus
A) The lumbar plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments C1-C5; the sacral plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments C5-T1. B) The lumbar plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments T12-L4; the sacral plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments S4-Co1. C) The lumbar plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments C1-C5; the sacral plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments S4-Co1. D) The lumbar plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments L1-L5; the sacral plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments L4-S5. E) The lumbar plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments T12-L4; the sacral plexus is a nerve network formed by axons from the anterior rami of spinal nerve segments L4-S4.