In relation to the size principle of motor unit recruitment, the mechanism of recruitment f) order is directly related to the: a) Size (cross-sectional area) of muscle fibres. b) Size (diameter) of the motor axons. c) Size of the motoneuron soma and dendrites. d) All of the above.

During exercise, activation of alpha-adrenergic receptors in skeletal musclearterioles:A)is opposed by metabolic vasodilation.B)decreases rapidlyC)causes relaxation of the vascular smooth muscle.D)causes hyperpolarization of vascular smooth muscle.E)causes activation of stretch receptors on the endothelium

According to the size principle, which type of muscle fibers are recruited last during a muscle contraction? Group of answer choices:   1.) Type I 2.) type IIB 3.) Type IIA

What is the mechanism possible for sensing muscle damage and triggering repair? Specifically in exercise and building muscle. Write full mechanism at the cellular level.

Define hypertrophy of skeletal muscle. Explain skeletal muscle adaptations to strength training (over time, not acute).  What are the mechanisms of action?  What hormones are involved?  What cell signaling occurs to produce hypertrophy? Identify two principles of resistance training and explain how they contribute to skeletal muscle adaptation. Provide at minimum, two reputable resources to back up your claims.

Discuss the similarities and differences by which Ca2+ activity is involved in initiating muscle contraction in skeletal versus smooth muscle fibers (hint: include Ca2+ sources, proteins it binds to, and signaling cascade it activates leading to contraction). (max 12 sentences)