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

Match the bands, labelled a. through c., with the descriptions. (Options may be used more than once or not at all.) a.A band b.I band c.H zone -composed of thick and thin filaments

Rigor mortis occurs when Ca²⁺ links actin and the myosin globular head together in a rigor complex.

Myosin has ATPase activity.

Single-unit smooth muscle has no innervation.

Which of these structures is the smallest unit of contraction within a skeletal muscle?

Summation events result from increasing amounts of cytoplasmic calcium levels.

Describe calcium's role in the contraction of the sarcomere in skeletal and cardiac muscle tissues.

What initiates contraction of smooth muscle?

Which of the following happens during a cross-bridge cycle in skeletal muscle?

During the ____________________ stroke, cross bridges of myosin pull the actin filaments in the sarcomere.

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 -basis of contraction is cross-bridge interaction between actin and myosin

Slow-oxidative muscle fibres have high resistance to fatigue.

Which of these statements does NOT correctly describe cross bridges?

The gradation of whole-muscle tension depends on the number of ____________________ that contract.

Match the types of muscles, labelled a. and b., with the characteristics. a.isometric contraction b.isotonic contraction -tension remains constant

Which of these statements correctly describes the summation of simple twitches?

Which of these statements correctly describes actin?

The sarcoplasmic reticulum stores which substance when a muscle is relaxed, and releases it for binding to which substance during contraction?

Which of these statements correctly describes fast glycolytic (type IIb) fibres?

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 -can exist over a variety of lengths with little change in tension