BIOS 256 Exam 3 Study Guide 2025: Anatomy & Physiology Practice Test

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EXAM 3: BIOS256 / BIOS 256 (LATEST UPDATE 2025)

ANATOMY & PHYSIOLOGY IV WITH LAB | REVIEW

QUESTIONS WITH VERIFIED ANSWERS | 100%

CORRECT | GRADE A - CHAMBERLAIN

Which of the following surrounds a bundle of myofibers?

.....ANSWER.....Perimysium

In skeletal muscle, each myofiber is surrounded by

.....ANSWER.....Endomysium.

The first thing that stops a muscle contraction after a motor

neuron stops sending ACh is: .....ANSWER.....Actylcholinesterase

destroys the ACh as it is removed from membrane receptors.

The sliding filament model of contraction involves

.....ANSWER.....Actin and myosin sliding past each other but not

shortening.

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Muscle tone is .....ANSWER.....A state of sustained partial

contraction of muscles.

Which of the following are composed of actin .....ANSWER.....Thin

filaments.

Muscle cells work together in groups known as motor units. These

consist for a motor neuron and .....ANSWER.....the muscle fibers

innervated by it

When a muscle fiber is stimulated by acetylcholine,-- channels on

the plasma membrane open .....ANSWER.....Na+

The number of muscle fibers in a contracted state in an otherwise

relaxed muscle is known as its .....ANSWER.....Muscle Tone

In an isometric contraction, muscles .....ANSWER.....stay the same

length

When a muscle is temporarily unable to respond to stimuli, it is in

which of the following periods .....ANSWER.....refractory period

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Myoglobin .....ANSWER.....holds a reserve supply of oxygen in

muscle cells

Which serves as a quick source to replete ATP in exercising

muscle .....ANSWER.....creatine phosphate

Smooth muscle is significantly different from striated muscle in

several ways. Which of the following is true

.....ANSWER.....smooth muscle can shorten and stretch more than

striated muscle

Which is not a function of blood .....ANSWER.....synthesis of

hormones

Which of these is not a normal plasma protein

.....ANSWER.....hemoglobin

Formed elements found in the blood that are about 7-8 Um in

diameter with no nuclei are .....ANSWER.....erythrocytes

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What organ in the body regulates erythrocyte production

.....ANSWER.....kidney

When red blood cells wear out, the iron of hemoglobin is saved

and recycled. The remained of the heme is

.....ANSWER.....excreted as bile pigments

James has a hemoglobin measurement of 15 g/100 ml blood.

This is .....ANSWER.....within the normal range

Sicking of red blood cells can be produced in those with sickle-

cell anemia by .....ANSWER.....travel at high altitudes

Which of the following is a precursor of a basophil

.....ANSWER.....myeloblast

Which of the following represents a normal differential count in a

healthy adult .....ANSWER.....65% neutrophils, 25% lymphocytes,

6% monocytes, 3% eosinophils, 1% basophils