Ch.12 Part A Flashcards
17) What two structures are primarily moved by muscles?
17) *Bones and Visceral
25) Several fascicles that are stimulated by a single efferent neuron are called a single;
25) motor unit*
28) Which of the following is NOT a characteristic of slow twitch muscles;
28) more mitochondria
More capillaries (more gas exchange)
Myoglobin
9) Which of the following is NOT a primary function of muscles?
Motion, heat , tension
5) When cells can contract without needing an action potential from a nerve, this is called;
5) Authrytemtic
36) The membranous internal structures which surround myofibrils and release calcium during a contraction are called;
36) sacroplasmic reticulum
31) Muscle sheaths converge and become;
31) tendons
16) The smallest contractile unit of muscle tissue, composed of actin and myosin filaments is a;
16) Myoyfibril
13) The darker color of the meat in a drumstick at KFC is due to the presence of high levels of ___ in the meat.
13)Myoglobin / mitochondria
21) A muscle fiber and a muscle cell are the same thing; T/F
21) T
14) Muscles that increase or decrease the angle between bones are known as (respectively);
14) Flexor decrease / Extensor Increase
10) The elastic anchor molecule that allows elasticity and extensibility of muscles is called;
10) Titin
32) Why do skeletal muscles have multiple nuclei?
32)To have local DNA protien Synthesis
22) If muscles do their primary job, what two things do they generate (primarily)?
22)** Generate force for movement
And Generates heat
24) A bundle of muscle fibers is called a;
24) Fascicle
18) The more cross bridges that a contractile unit can form the more what does it produce?
18) Tension / force
2) What types of cavities do muscles support?
2) abdominal cavity
3) Which of the following is NOT true of cardiac muscle cells?
3) involuntary and autrythmic
35) Why are t-tubules so vital to muscle contraction?
35) * they allow action potiential generated on surface to reach the myofilament
15) How do muscles help with body temperature maintenance?
15) Generating heat as a by product that helps with maintenance of body Temperature
11) What muscle pairs work in opposition to each other?
11) antagonist
34) The extensions of the cell membrane inside the muscle cell are called;
34) T-Tubules
7) Skeletal muscles are the only muscles in the body which are voluntary T/F
7) T
8) Most skeletal muscles are attached (at least one end) to;
8) bone
26) The thick fibers of the contractile unit (with moving heads) are called;
26) sacromer
12) Muscles can lengthen forcefully; T/F
12)F
33) The muscle cell membrane is called the;
33) scarolema
29) Most muscles are composed of only one motor unit; T/F
29)F
6) What type of muscle cell is found in places like the GI tract, blood vessels, and skin?
6) Smooth Muscle*
4) Which of the following is NOT an activity that fast/slow twitch muscles would be used for (respectively)
4) Know examples
Fast/ delicate playing piano , sprinting
30) The thin fibers of the contractile unit are called;
30) Actin
27) Which twitch type of muscle cells fatigue more easily?
27) Anaerobic
20) The liquid internal portion of muscle cells is called;
20) sacroplasma
