You mix a drop of blood with a drop of an unknown solution and look at the solution under the microscope. The cells look normal to you, so the solution you mixed with the blood would likely be
A) isotonic.
B) hypoosmotic.
C) hypotonic.
D) hypertonic.
E) hyperosmotic.
A) isotonic.
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Which of the following increases a child's risk for rickets? Check all that apply.
A. Heavy use of sunscreen B. Playing video games indoors C. A light complexion D. Malnutrition
Why are calcium ions necessary for skeletal muscle contraction?
A) Calcium ions increase the speed of the action potential transmitted along the sarcolemma. B) Calcium ions release the inhibition on Z discs. C) Calcium ions trigger the binding of myosin heads to actin filaments. D) Calcium ions cause ATP binding to actin. E) Calcium ions bind to regulatory proteins on the myosin filaments, changing both their shape and their position on the thick filaments.
This brain structure is greatly reduced in mammals relative to other vertebrates
A) Cerebellum B) Midbrain C) Forebrain D) Isocortex
Which of the following structures is located within the mediastinum?
A) pericardial sac B) small intestine C) lung D) spleen E) stomach