Curriculum
Login

Curriculum

Biology & Geology (STEM)

Chapter 2 - Hormonal Coordination in Living Organisms

0/32

Chapter 3 - Reproduction in Living Organisms

0/33

Chapter 4 - Immunity in Living Organisms

0/34

Chapter 5 - Molecular Biology - DNA Structure and Function

0/37

Chapter 6 - Molecular Biology - RNA, Protein Synthesis and Genetic Engineering

0/38
Quiz

Lesson 1: Endocrine Glands, The Pituitary, Thyroid and Parathyroid Glands — Lesson quiz

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
1.
Which hormone acts to decrease blood calcium levels when they rise above normal physiological limits?
Parathormone
Aldosterone
Thyroxine
Calcitonin
2.
Hypersecretion of Growth Hormone (GH) in adult individuals leads clinically to:
Acromegaly
Dwarfism
Gigantism
Myxedema
3.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Physiological vs. Structural Support in Plants?
Both physiological and structural supports disappear immediately when the plant wilts
Structural support relies solely on turgor pressure of living parenchyma
Physiological support is temporary and completely dependent on water uptake into vacuoles via osmosis, while structural support is permanent via deposition of cellulose, lignin, or suberin
Physiological support involves permanent deposition of lignin in stone cells
4.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Sliding Filament Theory of Muscle Contraction (Huxley)?
Both A-band and myosin filaments shrink by 50% in length
Cross-bridges pull actin filaments outward away from the M-line
Z-lines move away from each other as the muscle contracts
During sarcomere contraction, actin filaments slide over myosin filaments; the I-band and H-zone shorten, while the A-band length remains strictly constant
5.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Hormonal Regulation of Blood Glucose (Insulin and Glucagon)?
Glucagon is secreted by the adrenal cortex under stress
Beta cells of the islets of Langerhans secrete insulin to lower blood glucose by stimulating cellular uptake and glycogen synthesis, while alpha cells secrete glucagon to raise blood glucose by glycogenolysis
Alpha cells secrete insulin to elevate blood glucose levels
Insulin stimulates the breakdown of liver glycogen into glucose
  • 1
  • 2
  • 3
  • 4
  • 5