Questions & Answers
Browse all 18 questions from the
Developmental Biology and Physiology study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
At what stage of prenatal development does the human heart typically begin to beat?
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A
Weeks 3-4
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B
Weeks 8-9
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C
Weeks 12-14
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D
Week 20
2
Which bone in the human body is the last to complete ossification, typically occurring in the mid-twenties?
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A
Femur
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B
Clavicle
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C
Sternum
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D
Patella
3
What is the primary factor responsible for the 'growth spurt' observed during early adolescence?
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A
Increased sleep duration
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B
Release of growth hormone and sex steroids
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C
High protein intake
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D
Increased physical activity
4
Which part of the brain is the last to reach full structural maturity in humans, often not until the mid-twenties?
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A
Amygdala
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B
Cerebellum
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C
Prefrontal cortex
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D
Hippocampus
5
What is the medical term for the programmed cell death that helps shape human digits during embryonic development?
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A
Mitosis
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B
Apoptosis
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C
Meiosis
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D
Necrosis
6
During which decade of life does human muscle mass (sarcopenia) typically begin to naturally decline in sedentary individuals?
7
What is the primary source of nutrition for the human fetus during the first trimester?
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A
Maternal blood direct infusion
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B
The yolk sac
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C
Placental transfer
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D
Amniotic fluid absorption
8
The fontanelles (soft spots) in a human infant's skull typically close completely by what age?
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A
3-6 months
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B
9-12 months
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C
18-24 months
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D
3-4 years
9
Which hormone is predominantly responsible for the development of secondary sexual characteristics in females?
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A
Testosterone
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B
Estrogen
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C
Progesterone
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D
Cortisol
10
What is the approximate age at which the human brain reaches about 90% of its adult volume?
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A
Age 2
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B
Age 5
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C
Age 10
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D
Age 16
11
What is the 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 the speed of nerve impulse conduction
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C
To anchor neurons in the cortex
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D
To protect the brain from toxins
12
At what developmental stage does the 'palmar grasp reflex' typically disappear in infants?
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A
1 month
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B
4-6 months
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C
1 year
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D
2 years
13
What is the main physiological cause of menopause in the female reproductive system?
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A
Uterine atrophy
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B
Depletion of ovarian follicles
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C
Decrease in pituitary function
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D
Hypothalamic shutdown
14
During fetal development, which organ is the last to reach full functional maturity?
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A
Heart
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B
Liver
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C
Lungs
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D
Kidneys
15
The loss of skin elasticity in older adults is primarily due to the breakdown of which structural protein?
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A
Keratin
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B
Collagen
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C
Myosin
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D
Actin
16
What happens to the human lens of the eye as part of the normal aging process?
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A
It becomes more flexible
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B
It loses transparency and elasticity (presbyopia)
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C
It increases in refractive power
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D
It shifts color to blue
17
Which type of fat, which helps with thermoregulation, is prominent in newborns but decreases significantly with age?
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A
White adipose tissue
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B
Brown adipose tissue
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C
Visceral fat
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D
Subcutaneous fat
18
By the end of the first year of life, a human infant's birth weight typically:
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A
Doubles
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B
Triples
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C
Quadruples
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D
Increases by 50%
