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Exam 10: Muscle Tissue and Organization

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Question 1

Multiple Choice

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Which of the myofilaments of a muscle fiber has the active sites to which the heads of the thick filaments will bind?

A) Actin
B) Troponin
C) Tropomyosin
D) Myosin
E) Thick filament

F) B) and D)
G) B) and C)

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A

Question 2

Multiple Choice

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A sarcomere is defined as the distance from one _____ to the next.

A) Z disc
B) I band
C) H zone
D) A band
E) M line

F) C) and D)
G) B) and E)

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Question 3

Short Answer

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On a muscle fiber,the two terminal cisternae and the centrally placed T-tubule form a structure called a ______________.

In the human body,the synovial joint between two bones always serves as the fulcrum of the lever.

The calcium ions involved in skeletal muscle contraction bind to a(n) ______ subunit.

Which sequence correctly lists the changes that allow the thick and thin filaments to slide past one another in skeletal muscle contraction?

Which is not a protein found in thin filaments?

Skeletal muscle contraction requires large amounts of energy in the form of ___________ in order to complete the sequence of cyclic events that lead to sarcomere shortening.

A muscle whose name has "profundus" in it is located

The type of muscle fibers that have only a single nucleus,both thick and thin filaments,but no Z discs,are

The plasma membrane of a skeletal muscle fiber is called the ______________.

A fan-shaped muscle that exerts a point-focused contraction force is a _______________ muscle.

Which are possible functions of skeletal muscles? A: Maintenance of posture B: Both highly coordinated and localized simple movements C: Temperature regulation D: Support of certain body organs E: Restricting the movement of material through certain body tracts

The type of lever with the fulcrum in the middle is a ________ lever.

During an ________ contraction,the length of the muscle does not change.

Which contraction occurs when you try (unsuccessfully) to move a wall?

A first-class lever has its fulcrum between the force and the resistance.

Each skeletal muscle is composed of _____________,which are bundles of muscle fibers.

A circular muscle band that contracts at an orifice is also known as a _______________.

In the resting stage,a muscle with the word "rectus" in its name has straight fascicles.