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Alex777 [14]
3 years ago
6

Tapping the triceps brachii muscle tendon will result in reflexive elbow extension. this is an example of a ____________ reflex.

Biology
1 answer:
JulijaS [17]3 years ago
4 0
<span>This is an example of myotatic or stretch reflex. This is a muscle contraction that happens when there is stretching within a muscle. The myotatic reflex is a monosynaptic reflex, which provides automatic regulation of skeletal muscle length. A muscle spindle is stretched when a muscle lengthens. This increases nerve activity.</span>
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Learning Task No. 2: Copy and complete each statement. Choose from the
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1. Aorta

2. Left atrium

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Which part of the iceberg displaces water equal in weight to the buoyant force?explain.
ohaa [14]

The iceberg has weight Wi = Mig and the buoyant force is equal to the weight of the displaced water, Ww = Mwg. Furthermore, since the iceberg is floating, its weight exactly balances the buoyant force:


Ww = Wi
Mwg = Mig
VwRhowg = ViRhoig
Vw = Rhoi/Rhow Vi

So, the fraction of ice underwater, Vw/Vi, is given by the ratio of densities Rhoi/Rhow=0.87. Over 87% of an iceberg's volume (and mass) is underwater. As you can see, the convenient definition of the gram gives us a quick way to see how much of a floating substance lies below the surface of fresh water: the fraction is equal to that substance's mass density in g/cm?.

Summary

<span>Archimede's Principle of bouyancy states that the bouyant force on an object is equal to the weight of the fluid displaced by that object.<span>The underwater fraction of a substance floating on water is given by that substance's mass density in g/cm3.</span></span>
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