Biology of the Human Body
Eight medium-difficulty multiple-choice questions exploring core principles and consequences in human biology.
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Quiz Questions & Answers
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Question 1: What is the primary functional role of the mitochondrion in most human cells?
Protein synthesis from mRNA
Storing genetic information for the organism
Degrading extracellular pathogens
ATP production through cellular respiration
Question 2: Which blood component primarily transports oxygen to tissues?
Red blood cells containing hemoglobin
Platelets
White blood cells
Plasma proteins like albumin
Question 3: Why does the small intestine have a folded, villi-covered surface?
To store bile for digestion
To slow down gut microbiome growth
To filter toxins before the liver
To increase surface area for nutrient absorption
Question 4: If a person has low blood glucose, which hormone primarily raises plasma glucose?
Glucagon released from pancreatic alpha cells
Thyroxine from the thyroid
Aldosterone from the adrenal cortex
Insulin released from beta cells
Question 5: Which structural feature of neurons allows rapid transmission of action potentials along an axon?
High mitochondrial count in the soma
Myelin sheath with nodes of Ranvier
Large numbers of synaptic vesicles
Dendritic spines density
Question 6: How does homeostasis maintain stable internal conditions when external temperature rises?
Increasing bone density to store heat
Reducing respiratory rate to conserve heat
Shivering to generate heat
Sweating and increased skin blood flow to dissipate heat
Question 7: Which change best explains why elderly individuals may have reduced drug clearance?
Enhanced immune clearance of xenobiotics
Decline in kidney and liver function reducing metabolism and excretion
Increased muscle mass accelerating distribution
Higher basal metabolic rate increasing elimination
Question 8: Which statement corrects the myth that a single gene determines complex traits like height?
Height is determined entirely by mitochondrial DNA
Height is polygenic and influenced by many genes plus environment
One dominant gene always predicts height accurately
Single recessive mutations set adult height