Describe how the following would change if you were to extend your arm at the elbow (that is, stretch the biceps). a) the length of the muscle spindles in the biceps muscle
b) the firing of muscle-spindle afferents from the biceps muscle
c) the firing of alpha motor neurons that project to biceps muscle extrafusal fibers (assume you are trying to hold your arm in place.)

a. The biceps would relax causing it to increase in length

b. The firing of the muscle-spindle afferents from the biceps would decrease.

c. The alpha motor neurons would contract or decrease.

Explanation:

The skeletal joints in the human or animal body are controlled by muscles. Examples of these muscles are the biceps and triceps found in the human arm. They control the elbow joint with the biceps in front and triceps at the back of the elbow.

When the arm is extended from the elbow, the biceps relaxes or extends while the triceps contracts. This increases the length of the biceps and reduces the triceps length.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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