Which of the following could be used to study general features of cells?
A. binoculars
B. scanning electron microscope
C. transmission electron microscope
D. light microscope
E. a magnifying glass
D
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You and your colleague are medical technicians in a cardiac function lab. You are reading the ECG of a patient and your friend is trying to capture an image of the AV valves opening using an ultrasound. At what point should you tell your friend to start recording images?
A. After the T wave B. Just after the P wave C. Just before the T wave D. Just before the P wave E. At the beginning of the QRS complex
A mismatch of blood types during a transfusion is dangerous because ________
A) white blood cells from the donor's blood cause inflammation B) antibodies in the donor's plasma will attack and kill the recipient's healthy blood cells C) clotting factors in the donor's blood will cause unwanted clots known as thrombus D) preformed antibodies in the recipient's blood will bind and clump (agglutinate) the donated cells
Which structure consists of calcified connective tissue?
a) A b) B c) E d) F e) G
Which occurs FIRST as a result of ATP binding to myosin?
A. Actin binds to myosin. B. Cross-bridges rotate, sliding past the thin filament. C. Cross-bridge heads are cocked into an "energized" state. D. Actin dissociates from myosin. E. Ca2+ is released from the sarcoplasmic reticulum.