1.Which biochemical reaction provides energy for 5–10 seconds of sustained muscu

Question

1.Which biochemical reaction provides energy for 5–10 seconds of sustained muscular contraction?

AMP + PCr +H+ ATP + Cr

ATP + Pi ADP + Cr

ATP + H2O ADP + Pi + Energy

PCr + ADP +H+ ATP + Cr

2.When pyruvate enters the mitochondria, it becomes which of the following?

Acetyl CoA

Pyruvate carboxylase

Malate

Oxaloacetate

3.All of the following are characteristics of the creatine phosphate bioenergetic system except:

1 PCr = 3 ATP

Buffers H+

High-energy phosphates

Short term (5–10 seconds)

1 PCr = 1 ATP

4.During a 6.2-mile run (10 K) the predominate energy system activated is _________; however, at the end of the race when the runner is sprinting towards the finish line, __________ is (are) the predominate energy system(s).

aerobic glycolysis, anaerobic glycolysis

oxidative phosphorylation, PCr and anaerobic glycolysis

anaerobic glycolysis, PCr

oxidative phosphorylation, anerobic glycolysis

5.How many ATP molecules are generated from one molecule of glucose in glycolysis?

2.5 ATP

4 ATP

2 ATP

3 ATP

6.ATP is needed for both muscular contraction and muscular relaxation.

True

False

7.What energy system would primarily be used when performing a pole vault?

8.What are the limiting factors of the oxidative system?

9.When ATP is broken down within the muscle cells and energy is released from the chemical bonds, this process is illustrative of a/an:

enthalpy

exergonic reaction

Gibbs free energy

endergonic reaction

10.During intense exercise, when glucose molecules are broken down into pyruvate molecules, these molecules can enter the mitochrondria or quickly be transformed into ________.

fat

lactate (lactic acid)

ATP

pyruvate

11.The key regulatory and/or control enzyme of the electron transport chain is:

PFK

Cytochrome oxidase (CO)

Isocitrate dehydrogenase (ID)

Pyruvate kinase

12.During high-intensity exercise (800m run) which enzyme(s) is/are responsible for regulating the anaerobic glycolytic pathway?

PFK and PFK-1

LDH

PFK

Cytochrome oxidase

13.Which of the following factors does NOT influence enzyme activity?

Increased H+

pH

Specificity

Temperature

14.During high-intensity exercise, the _______ decreases in the muscle cell (fiber), thus contributing to the onset of muscular fatigue.

muscle glycogen

liver glycogen

lactic acid

pH

15.What are the primary characteristics of the anaerobic glycolytic system?

2 ATP's if glycogen is the substrate

18 chemical reactions

8 chemical reaction are repeated

there is a decrease in hydrogen ions

Explanation / Answer

Ans 1:

PCr + ADP + H+ = ATP + Cr

Ans 2: oxaloacetate.

When pyruvate enters mitochondria, then the enzyme of mitochondria i.e pyruvate carboxylase acts on pyruvate and converts it into oxaloacetate.

Ans 3: 1 PCr = 1 ATP

1PCr = 1ATP, is not a characteristic of creatine phosphate system because 1PCr results I'm 1ATP.

Ans 4: Aerobic glycolysis and Anaerobic glycolysis.

Ans 5: 2 ATP is produced.

Ans 6: False

ATP is required during muscle contraction and not during relaxation.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.