AP (Advanced Placement) Biology: Questions 286 - 288 of 327

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Question number: 286

» Respiratory Systems

MCQ▾

Question

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

Choices

Choice (5) Response

a.

50%

b.

25%

c.

97%

d.

70%

e.

20%

Question number: 287

» Muscle & Skeletal Systems

MCQ▾

Question

Osteoarthritis differs from rheumatoid arthritis in that

Choices

Choice (5) Response

a.

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

b.

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

c.

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

d.

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

e.

the former involves adjacent ligaments, whereas the latter does not

Question number: 288

» Muscle & Skeletal Systems

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 release ATP into the surrounding medium in a synchronized fashion.

b.

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

c.

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

d.

The cells start to form nerve connections between themselves.

e.

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

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