Portage Learning - BIOD 151 - Essential Human Portage Learning - BIOD 151 - Essential Human Anatomy & Physiology I - Module 5 Exam - A&P I Anatomy & Physiology I - Module 5 Exam - A&P I Muscular System - Origin & Insertion - Innervation Muscular System

Portage Learning - BIOD 151 - Essential Human
Anatomy & Physiology I - Module 5 Exam - A&P I
Muscular System - Origin & Insertion - Innervation
Contraction - Update - PSI - Respondus
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Questions and Answers

Verified Solutions Latest Update

,Insertion - Innervation - Contraction | Update | PSI - Respondus
LockDown Browser | 100 Points - 60 Minutes
Verified Questions and Answers Latest Version

1. What is the specialized plasma membrane of a muscle cell called?

A. Sarcoplasmic reticulum

B. Sarcolemma

C. Perimysium

D. Myofibril

Answer: B
Rationale: The sarcolemma is the specific name for the plasma membrane of a muscle
fiber.

2. Which connective tissue layer surrounds an entire muscle?

A. Epimysium

B. Perimysium

C. Endomysium

D. Deep fascia

Answer: A
Rationale: The epimysium is the outermost layer of connective tissue that wraps the entire
muscle.

, 3. A sarcomere is the region between two ________.

A. M-lines

B. H-zones

C. Z-discs

D. I-bands

Answer: C
Rationale: A sarcomere, the functional unit of a muscle fiber, is defined as the distance
between two consecutive Z-discs.

4. Which protein makes up the thick filaments of a myofibril?

A. Actin

B. Troponin

C. Myosin

D. Tropomyosin

Answer: C
Rationale: Thick filaments are composed of the protein myosin.

5. What is the function of the sarcoplasmic reticulum (SR) in muscle
contraction?

A. To generate ATP

B. To conduct action potentials

C. To store and release calcium ions

D. To synthesize myosin

Answer: C
Rationale: The SR is a specialized endoplasmic reticulum that regulates intracellular
calcium levels.