BIOS251 Week 8 Exam 4 Study Guide: A&P Practice Questions & Rationales

BIOS251 Week 8 Exam 4 – Comprehensive Practice
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Exam
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Anatomy & Physiology I | Chamberlain University
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100 Verified Questions with Correct Answers and Detailed
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Rationales
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Disclaimer: This practice exam is designed to help
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students prepare for the BIOS251 Week 8 Exam 4
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(covering Modules/Weeks 7-8 including Nervous
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System, Special Senses, and Endocrine System) at
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Chamberlain University. Questions are based on
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verified course content and standard anatomy and
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physiology curriculum . Students should consult their
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course syllabus, required readings, and instructors
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for official content. Always verify concepts
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independently
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,TABLE OF CONTENTS
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Section Topic oArea Questions


Section o1 Nervous oSystem o– oNeurons o& oNeurophysiology 1-20


Section o2 Central oNervous oSystem o(CNS) 21-35


Section o3 Peripheral oNervous oSystem o(PNS) o& oCranial oNerves 36-50


Section o4 Autonomic oNervous oSystem o(ANS) 51-65


Section o5 Special oSenses 66-85


Section o6 Endocrine oSystem 86-100




SECTION 1: Nervous System – Neurons &
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Neurophysiology (Questions 1-20)
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Question o1
Which opart oof oa oneuron oreceives osignals ofrom oother oneurons oand oconducts oimpulses
toward othe ocell obody?
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,A) oAxon
B) oDendrite
C) oAxon oterminal
D) oMyelin osheath

Correct oAnswer: oB) oDendrite

Rationale: oDendrites oare othe oreceiving oportion oof othe oneuron. oThey oreceive
chemical osignals o(neurotransmitters) ofrom oother oneurons oand oconduct ograded
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potentials otoward othe ocell obody o(soma) o.
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Question o2
The oresting omembrane opotential oof oa otypical oneuron ois oapproximately:

A) o-70 omV
B) o0 omV
C) o+30 omV
D) o-55 omV

Correct oAnswer: oA) o-70 omV

Rationale: oThe oresting omembrane opotential ois oapproximately o-70 omV o(negative
inside orelative oto ooutside). oThis ois omaintained oby othe osodium-potassium opump o(3
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Na⁺ oout, o2 oK⁺ oin) oand othe odifferential opermeability oof othe omembrane oto oK⁺ oand oNa⁺
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ions o.
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Question o3
Which oion's oinflux ois oprimarily oresponsible ofor othe odepolarization ophase oof oan oaction
potential?
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, A) oPotassium o(K⁺)
B) oSodium o(Na⁺)
C) oCalcium o(Ca²⁺)
D) oChloride o(Cl⁻)

Correct oAnswer: oB) oSodium o(Na⁺)

Rationale: oDepolarization ooccurs owhen ovoltage-gated osodium ochannels oopen,
allowing oNa⁺ oto orush ointo othe ocell odown oits oelectrochemical ogradient. oThis ocauses
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the omembrane opotential oto obecome opositive o(up oto oabout o+30 omV) o.
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Question o4
What ois othe ocorrect oorder oof oevents oduring oan oaction opotential?

A) oRepolarization, odepolarization, ohyperpolarization, oresting
B) oDepolarization, orepolarization, ohyperpolarization, oresting
C) oHyperpolarization, odepolarization, orepolarization, oresting
D) oDepolarization, ohyperpolarization, orepolarization, oresting

Correct oAnswer: oB) oDepolarization, orepolarization, ohyperpolarization, oresting

Rationale: oThe osequence oof oan oaction opotential: o(1) odepolarization o(Na⁺ oinflux), o(2)
repolarization o(K⁺ oefflux), o(3) ohyperpolarization o(excess oK⁺ oefflux), oand o(4) oreturn oto
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resting opotential ovia othe oNa⁺/K⁺ opump o.
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Question o5
The oabsolute orefractory operiod ois oimportant obecause oit:

A) oAllows osummation oof oaction opotentials
B) oEnsures ounidirectional opropagation oof oaction opotentials