A&p Muscular System Midterm

37 Questions | By Liellenr | Last updated: Mar 22, 2022 | Total Attempts: 110

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1.

Mark all the functions of the muscular system
- A.
  
  Movement
- B.
  
  Breathing
- C.
  
  Pumping blood
- D.
  
  Hearing
- E.
  
  Moving food
- F.
  
  Thinking
- G.
  
  Maintaining posture
- H.
  
  Generating heat
- I.
  
  None of the above
2.

Please fill answer below
3.

Skeletal muscles are ___________
- A.
  
  Voluntary
- B.
  
  Involuntary
- C.
  
  Both
- D.
  
  None of the above
4.

Smooth muscles are __________
- A.
  
  Voluntary
- B.
  
  Involuntary
- C.
  
  Independent
- D.
  
  None of the above
5.

Cardiac muscles are _________
- A.
  
  Devoluntary
- B.
  
  Voluntary
- C.
  
  Involuntary
- D.
  
  None of the above
6.

A structural unit of a myofibril in striated muscle, consisting of a dark band and the nearer half of each adjacent pale band - a basic unit of contraction
- A.
  
  Sarcomere
- B.
  
  Sarcoplasmic reticulum
- C.
  
  Motor unit
- D.
  
  Fascicle
- E.
  
  None of the above
7.

A cross-striation bisecting the I band of striated muscle myofibrils and serving as the anchoring point of actin filaments at either end of the sarcomere.
- A.
  
  Sarcomere
- B.
  
  Motor unit
- C.
  
  Myofibril
- D.
  
  Z-line
- E.
  
  None of the above
8.

What happens to the sarcomere during muscle contraction?
- A.
  
  Lengthens
- B.
  
  Shortens
- C.
  
  Extends
- D.
  
  None of the above
9.

A _____________ is a motor neuron and all the muscles fiber that the neuron controls.
- A.
  
  Motor neuron
- B.
  
  Motor unit
- C.
  
  Sarcomere
- D.
  
  None of the above
10.

The neuromuscular junction is the place where the neuron and muscle fiber meet.
- A.
  
  True
- B.
  
  False
11.

Which is a function of ATP in the contraction cycle?
- A.
  
  Provides energy to the myosin head, "cocking" it into position - this is the energy that is used to pull the actin filament
- B.
  
  Fresh ATP molecules break the actin-myosin cross bridge after the power stroke
- C.
  
  Both A and B
- D.
  
  None of the above
- E.
  
  There's only one way
12.

Mark the 3 ways muscles can obtain ATP?
- A.
  
  Creatine phosphate
- B.
  
  Krillitane phosphate
- C.
  
  Aerobic respiration
- D.
  
  Anaerobic respiration
- E.
  
  Lactic acid fermentation
- F.
  
  Fatty acid fermentation
13.

Which is plan A in the three ways which muscle can obtain ATP?
- A.
  
  Lactic acid fermentation
- B.
  
  Aerobic respiration
- C.
  
  Creatine phosphate
- D.
  
  None of the above
14.

What does creatine phosphate do?
- A.
  
  It stores energy to recharge ADP
- B.
  
  Builds up byproduct that we have to deal with
- C.
  
  Glycolysis, link reaction, krebs cycle
- D.
  
  All of the above
15.

___________gives muscles their red color.
- A.
  
  Hemoglobin
- B.
  
  Myoglobin
- C.
  
  Myosin
- D.
  
  None of the above
16.

The primary energy source for ATP in muscles is ____________
- A.
  
  ATP
- B.
  
  Creatine phosphate
- C.
  
  Krillitane phosphate
- D.
  
  ADP
17.

In plan A, ATP must be used ___________ - if the energy is needed later, it is transferred to creatine and stored, then transferred back into ATP when the muscle needs to contract.
- A.
  
  Immediately
- B.
  
  Soon
- C.
  
  Over time
- D.
  
  Only in small amounts
- E.
  
  Never
18.

What is the second way muscles can obtain ATP? (Plan B)
- A.
  
  Airobic respiration
- B.
  
  Anaerobic respiration
- C.
  
  Aerobic respiration
- D.
  
  Heirrobic respiration
19.

Most of the energy (ATP) released during aerobic respiration is lost. This energy is lost as __________.
- A.
  
  Lukewarm
- B.
  
  Heat
- C.
  
  Cold
- D.
  
  None of the above
20.

Lactic acid fermentation is plan ______ in the ways which muscles obtain ATP
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
21.

When does lactic acid fermentation occur?
- A.
  
  If there is too little oxygen present
- B.
  
  When there is oxygen present
- C.
  
  When you "feel the burn"
- D.
  
  When ATP is used up
22.

Muscle fatigue is when
- A.
  
  There is a build up of lactic acid
- B.
  
  When you "feel the burn"
- C.
  
  When a muscle losses the ability to contract - only temporarily
- D.
  
  All of the above
- E.
  
  None of the above
23.

After the muscle is done contracting, oxygen is needed to break down lactic acid, and to restore ATP and creatine phosphate to their "resting levels. The amount of oxygen required to accomplish these tasks after exertion is called ______________.
- A.
  
  Breath debt
- B.
  
  Debt
- C.
  
  Oxygen debt
- D.
  
  Air debt
24.

Mark the 4 parts/ phases of a single muscle twitch
- A.
  
  Stimulus
- B.
  
  Procrastination
- C.
  
  Brief delay- latent period
- D.
  
  Contraction
- E.
  
  Attraction
- F.
  
  Relaxation
25.

When a muscle is stimulated, it will only respond if the signal from the nervous system reaches a certain strength. This required stimulus is called a _______________
- A.
  
  Slow twitch
- B.
  
  All-or-none response
- C.
  
  Threshold stimulus
- D.
  
  None of the above