Questions & Answers
Browse all 25 questions from the
Developmental Biology and Health Milestones study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
At approximately what age does the human brain reach about 90% of its adult volume?
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A
2 years
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B
6 years
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C
12 years
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D
18 years
2
Which hormone is primarily responsible for the onset of puberty and the physical growth spurt?
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A
Insulin
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B
Melatonin
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C
Gonadotropin-releasing hormone
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D
Cortisol
3
What is the primary cause of the 'infant mortality' gap in the first month of life globally?
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A
Congenital anomalies
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B
Preterm birth complications
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C
Infectious diseases
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D
Nutritional deficiencies
4
Which sensory system is the least developed at the time of a human infant's birth?
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A
Vision
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B
Hearing
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C
Touch
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D
Taste
5
During which stage of human development do the secondary sexual characteristics first appear?
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A
Infancy
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B
Early Childhood
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C
Puberty
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D
Adulthood
6
What is the average age range for the completion of the permanent tooth eruption (excluding wisdom teeth)?
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A
6–8 years
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B
10–12 years
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C
14–16 years
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D
18–20 years
7
Which component of the human body experiences a decrease in total water percentage from birth to adulthood?
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A
The brain
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B
The skin
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C
The bones
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D
The blood
8
What is the clinical term for the period of rapid physical growth and reproductive maturation?
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A
Senescence
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B
Adolescence
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C
Gestation
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D
Neonatal period
9
Which mineral is most critical for bone density development during the adolescent growth spurt?
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A
Iron
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B
Calcium
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C
Potassium
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D
Magnesium
10
At what stage of development is the 'grasping reflex' typically present in a human infant?
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A
Prenatal only
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B
Birth to 4–6 months
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C
1–2 years
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D
Adulthood
11
Which major organ system continues to develop and change its structural connectivity well into the mid-twenties?
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A
Digestive system
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B
Prefrontal cortex
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C
Respiratory system
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D
Endocrine system
12
What condition is associated with the 'closing' of the fontanelles (soft spots) in a human infant's skull?
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A
Skeletal maturation
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B
Brain overgrowth
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C
Dehydration
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D
Mineral deficiency
13
During aging, which aspect of cardiovascular health is most consistently affected by arterial stiffening?
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A
Heart rate variability
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B
Systolic blood pressure
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C
Stroke volume
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D
Red blood cell production
14
What is the primary function of the myelin sheath in the developing nervous system?
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A
To produce neurotransmitters
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B
To increase signal conduction speed
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C
To prevent viral infection
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D
To store metabolic energy
15
Which stage of the human lifespan is associated with the peak of physical strength and reaction time?
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A
Adolescence
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B
Early adulthood (20s-30s)
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C
Middle age
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D
Late adulthood
16
What occurs to the thymus gland as a human progresses from childhood into adulthood?
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A
It grows larger
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B
It remains the same size
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C
It undergoes involution (shrinking)
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D
It begins to produce sex hormones
17
Which vitamin is essential for blood coagulation and is commonly administered as an injection to newborns?
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A
Vitamin A
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B
Vitamin C
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C
Vitamin D
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D
Vitamin K
18
What is the typical range of REM sleep duration in newborns compared to adults?
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A
Lower in newborns
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B
Higher in newborns
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C
Equal in both
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D
Non-existent in newborns
19
Which part of the body maintains a disproportionately large size relative to the rest of the body during infancy?
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A
The legs
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B
The torso
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C
The head
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D
The hands
20
The loss of muscle mass and strength associated with aging is known as what?
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A
Sarcopenia
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B
Osteoporosis
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C
Atrophy
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D
Cachexia
21
In human development, which of these is considered a 'fine motor skill'?
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A
Running
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B
Walking
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C
Pincer grasp
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D
Jumping
22
Which health marker is most commonly used to assess a newborn's physical status immediately after birth?
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A
BMI score
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B
Apgar score
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C
Blood glucose level
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D
Oxygen saturation
23
What happens to the lens of the eye as a normal part of the aging process?
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A
It becomes more flexible
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B
It loses elasticity and transparency
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C
It increases in color saturation
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D
It shrinks in diameter
24
Which of the following describes the 'cephalocaudal' trend of physical development?
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A
Development from the center outward
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B
Development from head to tail
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C
Development from right to left
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D
Development from feet to head
25
At what developmental stage does the immune system typically reach its peak functionality?
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A
Infancy
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B
Puberty
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C
Early adulthood
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D
Late adulthood
