Question

The resistance (R) to flow in an artery is inversely proportional to _____, where r represents the radius of the artery.

r²

r³

r

r⁵

r⁴

_______ states that the magnitude of the buoyant force is equal to the weight of the displaced liquid.

Buoyancy Principle

Archimedes' Principle

Magnus' Principle

Newton's Principle

Bernoulli's Principle

As described in the Biomechanics of Injury video, the term sprain refers to injury of

tendon

ligament

muscle

bone

cartilate

In a lateral ankle sprain, the ligament most likely to be injured is the _____ ligament.

anterior tibiofibular

posterior tibiofibular

posterior talofibular

interosseous

anterior talofibular

Answer 1

1) The answer is r4 (R=1/r4).

This means if artery or arteriole constricts to half of its original radius, the resistance to flow will increase 16 times.

2) Archimedes' principle is right answer.

It states that the upward buoyant force exerted by the body that is immersed in a fluid, whether fully or partially submerged is equal to the weight of the fluid that the body displaced.

3) The answer is ligament.

A sprain is an injury to a ligament(tissue that connects two or more bones at a joint). When a sprain occurs, ligament may get stretched or torn.

4) The answer is anterior talofibular.

It is the weakest of all the three ligaments of ankle. It is most likely to get injured during lateral ankle sprain.