Q: During cellular respiration, which of the following equations correctly represents the overall process of glucose oxidation?

$$C_6H_{12}O_6$ + 6\ O_2$ \rightarrow 6\ CO_2$ + 6\ H_2O + \text{energy (ATP)}$$

Question 1

Which of the following best describes the primary function of the sodium-potassium pump ($$Na^+/K^+$$ ATPase) in human physiology?

Accepted Answer

It maintains the resting membrane potential by actively transporting $$3\ Na^+$$ ions out of and $$2\ K^+$$ ions into the cell, using ATP.

Question 2

A patient is experiencing muscle weakness and irregular heart rhythms. Blood tests reveal low potassium levels. Which physiological process is most likely impaired?

Accepted Answer

Active transport of $$K^+$$ ions into cells via the sodium-potassium pump

Question 3

During cellular respiration, which of the following equations correctly represents the overall process of glucose oxidation?

Accepted Answer

$$C_6H_{12}O_6$ + 6\ O_2$ ightarrow 6\ CO_2$ + 6\ H_2O + 	ext{energy (ATP)}$$

Question 4

Which of the following best explains why enzymes are essential for metabolic reactions in the human body?

Accepted Answer

They act as catalysts, lowering the activation energy and increasing the rate of reactions.

Question 5

A genetic mutation causes a defect in the structure of collagen. Which tissue type is most likely to be directly affected?

Accepted Answer

Connective tissue

Question 6

Which of the following scenarios best illustrates the concept of homeostasis?

Accepted Answer

A person sweats to cool down when their body temperature rises above normal.

Question 7

Which of the following is a correct example of negative feedback in human physiology?

Accepted Answer

Secretion of insulin in response to high blood glucose, which lowers blood glucose levels

Question 8

A patient with a genetic disorder cannot produce the enzyme lactase. Which of the following best describes the consequence of this deficiency?

Accepted Answer

Inability to break down lactose in the small intestine, leading to gastrointestinal symptoms

Question 9

Which of the following best describes the role of mitochondria in human cells?

Accepted Answer

They generate ATP through aerobic respiration.

Question 10

A person is exposed to a cold environment. Which physiological response is most likely to occur as a result of homeostatic regulation?

Accepted Answer

Shivering to generate heat

Question 11

Which of the following best explains why phospholipids are critical components of the plasma membrane?

Accepted Answer

They form a bilayer with hydrophobic tails and hydrophilic heads, creating a selective barrier.

Question 12

A patient is diagnosed with sickle cell anemia, a disease caused by a single amino acid substitution in hemoglobin. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 13

Which of the following equations correctly represents the relationship between pH and hydrogen ion concentration $$[H^+]$$?

Accepted Answer

$$pH = -\log_{10} [H^+]$$

Question 14

A person is unable to absorb vitamin B12 due to a lack of intrinsic factor. Which organ system is primarily responsible for producing intrinsic factor?

Accepted Answer

Digestive system

Question 15

Which of the following best describes the function of ribosomes in a human cell?

Accepted Answer

They assemble amino acids into proteins based on mRNA instructions.

Question 16

A patient presents with symptoms of dehydration. Which of the following best explains the movement of water from the extracellular fluid into the cells?

Accepted Answer

Osmosis

Question 17

Which of the following is an example of a positive feedback mechanism in the human body?

Accepted Answer

Release of oxytocin to intensify uterine contractions during childbirth

Question 18

A patient with cystic fibrosis has a mutation affecting chloride ion channels. Which of the following best describes the impact on epithelial tissue?

Accepted Answer

Decreased chloride secretion leads to thick, sticky mucus in the airways

Question 19

Which of the following best describes the relationship between structure and function in human physiology?

Accepted Answer

The structure of a biological molecule or organ determines its function.

Question 20

A patient is found to have a mutation that prevents the formation of gap junctions between cardiac muscle cells. Which physiological process would be most directly impaired?

Accepted Answer

Transmission of electrical impulses for synchronized heart contraction

Human Physiology (BMS 300) Syllabus and Study Guide

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