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A & P Chapter 6
| Question | Answer |
|---|---|
| Striated involuntary muscle tissue is classified as ________ muscle. | cardiac |
| A smooth, sustained contraction, with no evidence of relaxation, is called ________. | fused, or complete, tetanus |
| The prime mover of arm abduction is the ________ muscle. | deltoid |
| What creates the alternating light and dark bands that provides the striation pattern on skeletal muscle tissue? | A bands and I bands |
| Which one of the following is composed mostly of the protein myosin? | thick filaments |
| A motor neuron and all of the skeletal muscle fibers it stimulates are termed a ________. | motor unit |
| During skeletal muscle contraction, to what do myosin heads bind? | actin filaments |
| Creatine phosphate (CP) functions within the muscle cells by ________. | storing energy that will be transferred to ADP to resynthesize ATP as needed |
| Which of the following is a type isometric exercise in which muscles increase in size and strength? | lifting weights |
| Which of these muscles is located on the ventral (anterior) side of the body? | pectoralis major |
| Which muscle forms the curved calf of the posterior leg? | gastrocnemius |
| Like the biceps brachii muscle, which muscle is a prime mover in elbow flexion? | brachialis |
| What enzyme breaks down acetylcholine into acetic acid and choline to prevent continued contraction of the muscle fiber? | acetylcholinesterase |
| Which of the following is an example of an isometric contraction? | pushing against an immovable wall |
| Which one of the following is NOT a criterion generally used in naming muscles? | method of attachment of the muscle to bone |
| A neuromuscular junction consists of one neuron and all the skeletal muscles it stimulates. | FALSE |
| The formation of cross bridges requires both calcium ions and ATP | TRUE |
| All muscles have at least two attachments: the origin and the insertion. | TRUE |
| The effect of the neurotransmitter on the muscle cell membrane is to temporarily modify its permeability of ions such as Na+ and K+. | TRUE |
| The deltoid is a prime mover of arm adduction. | FALSE |
| Muscle tissue composed of branching cells and intercalated discs | cardiac muscle tissue |
| Muscle tissue that maintains posture, body position, and stabilizes joints | skeletal muscle tissue |
| Muscle tissue that activates arrector pili muscles to stand hairs on end | smooth muscle tissue |
| The sarcoplasmic reticulum stores this chemical | calcium ions |
| Chemical that enters a muscle cell upon excitation | sodium ions |
| Gap between the axon terminals and the plasma membrane of a neighboring muscle cell | synaptic cleft |
| Enzyme that breaks down acetylcholine (ACh) | acetylcholinesterase |
| Electrical current that travels the length of the sarcolemma that results in the contraction of the muscle fiber | action potential |
| What organelle wraps and surrounds the myofibril and stores calcium? | sarcoplasmic reticulum |
| Anaerobic glycolysis requires ________ to make ATP. | glucose only |
| Which is NOT a function of the muscular system? | blood cell formation |
| A sarcomere is ________. | the contractile unit between two Z discs |
| Why are calcium ions necessary for skeletal muscle contraction? | Calcium ions trigger the binding of myosin heads to actin filaments |
| Creatine phosphate (CP) functions within the muscle cells by ________. | storing energy that will be transferred to ADP to resynthesize ATP as needed |
| Which muscle forms the curved calf of the posterior leg? | gastrocnemius |
Created by:
Cinda