Exam 6: The Peripheral Nervous System: Afferent Division; Special Senses

The corticospinal system controls fine, discrete, voluntary body movements.

Which of these statements correctly describes the H zone?

Which of these statements does NOT correctly describe smooth muscle?

The ____________________ is the extensor muscle found in the thigh that contracts during the patellar tendon reflex.

Which of these actions happens during contraction of skeletal muscle fibres?

The larger the motor units within a muscle, the more precisely controlled the gradations of contraction.

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) a.skeletal muscle only b.single-unit smooth muscle only c.cardiac muscle only d.skeletal muscle and cardiac muscle e.skeletal muscle and single-unit smooth muscle f.single-unit smooth muscle and cardiac muscle g.skeletal, single-unit smooth, and cardiac muscles -found in the walls of hollow organs such as the stomach

Which of these characteristics does NOT apply to smooth muscle?

Which of these factors causes muscle relaxation?

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) a.actin only b.myosin only c.actin and myosin d.troponin-tropomyosin complex e.actin, troponin, and tropomyosin f.actin, myosin, troponin, and tropomyosin -possess cross bridges

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) a.skeletal muscle only b.single-unit smooth muscle only c.cardiac muscle only d.skeletal muscle and cardiac muscle e.skeletal muscle and single-unit smooth muscle f.single-unit smooth muscle and cardiac muscle g.skeletal, single-unit smooth, and cardiac muscles -Which events involved in muscle cell contraction are sequenced in the correct order? 1. Sodium channels open, allowing sodium to flow in. 2. Impulse reaches axon's synaptic knob. 3. ACh binds to receptors on sarcolemma. 4. Synaptic vesicles fuse with neuron's membrane and release ACh via exocytosis. 5. If enough sodium moves into the muscle cell, an impulse (action potential) develops. a.1, 2, 3, 4, 5 b.2, 1, 3, 4, 5 c.2, 4, 3, 1, 5 d.3, 4, 5, 1, 2

Which of these statements correctly describes smooth muscle?

Muscle cells are the only cell types that contain intracellular contractile proteins.

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) a.skeletal muscle only b.single-unit smooth muscle only c.cardiac muscle only d.skeletal muscle and cardiac muscle e.skeletal muscle and single-unit smooth muscle f.single-unit smooth muscle and cardiac muscle g.skeletal, single-unit smooth, and cardiac muscles -contraction triggered as Ca²⁺ physically pulls troponin and tropomyosin from its blocking position over actin's binding sites for the cross bridges

Submaximal isometric contractions are important for which of the following activities?

How does contraction of smooth muscle differ from that of skeletal muscle?

Which of these characteristics would NOT be exhibited in the muscle cells of a marathon runner's legs?

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) a.actin only b.myosin only c.actin and myosin d.troponin-tropomyosin complex e.actin, troponin, and tropomyosin f.actin, myosin, troponin, and tropomyosin -found in the A band

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) a.actin only b.myosin only c.actin and myosin d.troponin-tropomyosin complex e.actin, troponin, and tropomyosin f.actin, myosin, troponin, and tropomyosin -found in the H zone

Which of the following properties characterizes fast oxidative (type IIa) muscle fibres?