Q: Which equation best represents the use of creatine phosphate in muscle cells during intense exercise?

$$ \text{Creatine phosphate} + ADP \rightarrow \text{Creatine} + ATP $$

Question 1

Which of the following best describes the difference between the somatic and autonomic nervous systems?

Accepted Answer

The somatic nervous system controls voluntary movements of skeletal muscles, while the autonomic nervous system regulates involuntary functions such as heart rate and digestion.

Question 2

Which of the following is NOT a feature of a somatic motor pathway?

Accepted Answer

It innervates smooth muscle tissue.

Question 3

During skeletal muscle contraction, which event occurs FIRST at the neuromuscular junction?

Accepted Answer

Acetylcholine is released from the motor neuron.

Question 4

Which formula correctly represents the relationship between force, muscle length, and contraction type in an isometric contraction?

Accepted Answer

$$ \Delta L = 0 $$

Question 5

Which of the following is a role of ATP in skeletal muscle cells?

Accepted Answer

ATP is used to detach myosin heads from actin during muscle relaxation.

Question 6

Which mechanism allows a skeletal muscle cell to relax after contraction?

Accepted Answer

Calcium ions are actively transported back into the sarcoplasmic reticulum using ATP.

Question 7

Which of the following best describes the difference between isotonic and isometric muscle contractions?

Accepted Answer

Isotonic contractions involve a change in muscle length, while isometric contractions involve no change in muscle length.

Question 8

Which equation best represents the use of creatine phosphate in muscle cells during intense exercise?

Accepted Answer

$$ 	ext{Creatine phosphate} + ADP ightarrow 	ext{Creatine} + ATP $$

Question 9

Which of the following is a distinguishing feature of smooth muscle compared to skeletal muscle?

Accepted Answer

Smooth muscle cells lack striations due to irregular arrangement of myofilaments.

Question 10

Which mechanism is NOT a way to increase cytosolic $$ Ca$$^{2+}$$  in $$smooth muscle?

Accepted Answer

Direct phosphorylation of myosin by ATP.

Question 11

Which of the following best describes a monosynaptic reflex?

Accepted Answer

A reflex involving only one synapse between the sensory and motor neuron.

Question 12

Which of the following is an example of a feedforward reflex in voluntary movement?

Accepted Answer

Anticipatory postural adjustments before lifting a heavy object.

Question 13

Which of the following correctly describes the path of blood flow through the heart?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → lungs → pulmonary vein → left atrium → left ventricle → aorta

Question 14

Which equation best represents the blood pressure gradient between arteries and veins?

Accepted Answer

$$ \Delta P = P_{arteries} - P_{veins} $$

Question 15

Which physical feature is unique to cardiac muscle cells compared to skeletal muscle cells?

Accepted Answer

Presence of intercalated discs containing gap junctions and desmosomes.

Question 16

Which cellular mechanism is responsible for the 'charge plateau' in the action potential of cardiac contractile cells?

Accepted Answer

Sustained opening of voltage-gated $$ Ca$$^{2+}$$ $$ channels.

Question 17

Which of the following best describes the main function of capillaries?

Accepted Answer

To facilitate exchange of gases, nutrients, and waste between blood and tissues.

Question 18

Which equation best represents the relationship between ventilation rate ($$ V $$), tidal volume ($$ TV $$), and minute ventilation ($$ MV $$)?

Accepted Answer

$$ MV = V 	imes TV $$

Question 19

Which of the following is a distinguishing feature of Type 2 alveolar cells?

Accepted Answer

They secrete surfactant to reduce surface tension in the alveoli.

Question 20

Which muscle is primarily responsible for inspiration, and what effect does its contraction have on the lungs?

Accepted Answer

The diaphragm; its contraction increases thoracic volume, causing lung expansion.

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