AP (Advanced Placement) Biology: Questions 286 - 288 of 868

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Question number: 286

» Respiratory Systems

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MCQ▾

Question

What % of O2 is transported by RBCs in the blood?

Choices

Choice (5)Response

a.

50%

b.

25%

c.

70%

d.

97%

e.

20%

Question number: 287

» Muscle & Skeletal Systems

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MCQ▾

Question

Osteoarthritis differs from rheumatoid arthritis in that

Choices

Choice (5)Response

a.

the former is caused by wear, whereas the latter is caused by infection

b.

the former involves adjacent ligaments, whereas the latter does not

c.

the former is initiated by mechanical mechanisms, whereas the latter is an autoimmune disorder

d.

the former affects primarily synovial joints, whereas the latter primarily affects fibrocartilage

e.

the former retains overall integrity of the joint, whereas the latter produces permanent deformation

Question number: 288

» Muscle & Skeletal Systems

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MCQ▾

Question

Cardiac muscle cells, when grown in the lab in petri dishes, begin to beat in a synchronized fashion when they make contact with each other. Why might this be so?

Choices

Choice (5)Response

a.

The cells connect to each other by gap junctions upon making contact.

b.

The cells release ATP into the surrounding medium in a synchronized fashion.

c.

The cells start to form nerve connections between themselves.

d.

The cells release into the surrounding medium calcium ions that synchronizes contraction.

e.

When 1 cell starts to contract, any cell in contact responds to the sudden motion as a physically gated stimulus.

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