Multiple ChoiceWhy is having a hydrostatic skeleton rather than an internal skeleton advantageous to an earthworm?
Multiple ChoiceWhen comparing the different styles and adaptations of each major type of locomotion, what is the most energy-efficient mode of locomotion?
Open QuestionWhich of the following statements regarding control of muscle tissue is/are correct? Select True or False for each statement.T/F All skeletal muscles are voluntary.T/F Cardiac muscle is involuntary.T/F Some smooth muscle tissues are voluntary and others are involuntary.T/F Parasympathetic and sympathetic neurons innervate skeletal, cardiac, and smooth muscle tissues.
Open QuestionA human's internal organs are protected mainly by thea. hydrostatic skeleton.b. axial skeleton.c. exoskeleton.d. appendicular skeleton.
Open QuestionIn muscle cells, myosin molecules continue moving along actin molecules as long asa. ATP is present and troponin is not bound to Ca2+.b. ADP is present and tropomyosin is released from intracellular stores.c. ADP is present and the intracellular acetylcholine level is high.d. ATP is present and the intracellular Ca2+ concentration is high
Open QuestionDuring the contraction of a vertebrate skeletal muscle fiber, calcium ionsa. break cross-bridges as a cofactor in hydrolysis of ATP.b. bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed.c. transmit action potentials from the motor neuron to the muscle fiber.d. spread action potentials through the T tubules.