$$BMR = 70 \times (W$$^{0.75}$$)$$

Question 1

Which of the following best describes the sliding filament mechanism in muscle contraction?

Accepted Answer

Actin filaments slide past myosin filaments, shortening the sarcomere.

Question 2

During muscle contraction, which event directly follows the release of acetylcholine at the neuromuscular junction?

Accepted Answer

An action potential is generated in the muscle cell membrane.

Question 3

Which equation best represents the relationship between pressure, volume, and airflow in the lungs during inspiration?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 4

A patient with a mutation in the gene encoding myosin would most likely experience which of the following?

Accepted Answer

Impaired muscle contraction due to inability to form cross-bridges.

Question 5

Which structure is responsible for generating most of the heat in the human body?

Accepted Answer

Skeletal muscles during contraction.

Question 6

Which of the following best explains why breathing is essential for humans?

Accepted Answer

It provides oxygen for cellular respiration, which produces ATP.

Question 7

During inhalation, which of the following occurs in the thoracic cavity?

Accepted Answer

The diaphragm contracts, increasing thoracic volume and decreasing pressure.

Question 8

Which of the following is a function of the intercostal muscles during respiration?

Accepted Answer

They elevate the rib cage during inspiration to increase lung volume.

Question 9

Which equation best represents the calculation of basal metabolic rate (BMR)?

Accepted Answer

$$BMR = 70 	imes (W$$^{0.75}$$)$$

Question 10

Which digestive structure increases surface area to maximize nutrient absorption?

Accepted Answer

Villi in the small intestine.

Question 11

Which of the following best describes peristalsis?

Accepted Answer

Wave-like contractions of smooth muscle that propel food through the digestive tract.

Question 12

Which of the following is an accessory organ of the digestive system and its primary function?

Accepted Answer

The pancreas, which produces digestive enzymes.

Question 13

Which of the following best describes the molecular structure of a gene?

Accepted Answer

A sequence of nucleotides in DNA encoding a specific protein.

Question 14

If a child inherits one dominant allele (A) and one recessive allele (a) for a trait, what is their genotype and phenotype?

Accepted Answer

Genotype: Aa; Phenotype: Dominant trait expressed.

Question 15

Which of the following best describes the Law of Segregation?

Accepted Answer

Each parent passes one allele for each gene to their offspring.

Question 16

A Punnett Square is used to:

Accepted Answer

Predict the probability of offspring genotypes and phenotypes.

Question 17

Which of the following is an example of incomplete dominance?

Accepted Answer

A red flower and a white flower produce pink offspring.

Question 18

Which of the following best describes codominance?

Accepted Answer

Both alleles are fully expressed in the phenotype.

Question 19

Which of the following best explains how nondisjunction during meiosis can affect offspring?

Accepted Answer

It can result in gametes with abnormal numbers of chromosomes, leading to disorders such as Down syndrome.

Question 20

Which of the following best describes polygenic inheritance?

Accepted Answer

Multiple genes contribute to a single trait, resulting in a range of phenotypes.

Comprehensive Study Guide: Human Muscular, Respiratory, Digestive Systems, and Genetics

Study Guide - Practice Questions