The chordae tendineae
keep the semilunar valves open.
keep the AV valves from being pushed into the atria during ventricular systole.
stimulate the SA node.
are part of the internal conduction system of the heart.
keep the AV valves from being pushed into the atria during ventricular systole.
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What is the role of the perichondrium that surrounds the cartilaginous model early in the process of endochondral ossification?
A. It produces red bone marrow. B. It produces chondrocytes and the model grows. C. It produces osteoclasts. D. It forms the epiphyseal plate. E. It forms trabeculae that accumulate osteoid.
Cellular responses to hormones that initiate second-messenger systems include ________.
A) possible activation of several different second-messenger systems B) cyclic AMP phosphodiesterase formation of an active second messenger C) formation of a specific protein kinase that acts on a series of extracellular intermediates D) hormone binding to intracellular receptors
What part of the microscope regulates the amount of light that passes through the slide?
A) Fine adjustment knob B) Condenser C) Substage light D) Iris diaphragm
What does thyrotropin-releasing hormone target?
A.)hypothalamus B.)posterior pituitary (neurohypophysis) C.)anterior pituitary (adenohypophysis) D.)thyroid gland