True or False: Negative feedback mechanisms cause the original stimulus to become even stronger

The neurotransmitter released by the presynaptic membrane (axon knob) for skeletal muscle contraction is always:     Dopamine.     Norepinephrine.     Acetylcholine.     None of the above.

Which of the following statements are true? Multiple Choice Muscles work in antagonistic pairs because if one muscle shortens during contraction, the opposing muscle across the joint must relax. Muscles work in antagonistic pairs because tendons lengthen during contraction. Muscles work in antagonistic pairs because muscles lengthen during contraction. Muscles work in antagonistic pairs because if one muscle pushes during contraction, the opposing muscle across the joint must pull.

The ocular muscle has a very fast response time compared to the gastrocnemius and soleus muscles. What is the use for this? The muscle needs to react fast in order to respond quickly to external stimuli. The ocular muscle is quite thin and can easily twitch. The gastrocnemius muscle has too much muscle mass to be able to respond quickly. The soleus muscle is far away from the brain compared to the ocular muscle.

Ca2+ does not play a role in muscle relaxation true or false

When a person builds muscle, such as from weight lifting, skeletal muscle fibers divide to increase muscle mass.  True  False

True or False: Neurotransmitters have different shapes.

A muscle cannot respond to appropriate nerve stimuli. Which muscle characteristic is impaired? Contractility Extensibility Elasticity Irritability

Which components of the nervous system are involved with skeletal muscle movement. Be specific about how the motor impulses moves through the body.

True or False: external structures for movement include wings,fins and legs