Table of contents

1. Introduction to Biology2h 42m
2. Chemistry3h 37m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 6m
16. Regulation of Expression3h 31m
17. Viruses37m
- Viruses
  37m
18. Biotechnology2h 58m
19. Genomics17m
- Genomes
  17m
20. Development1h 5m
21. Evolution3h 1m
22. Evolution of Populations3h 53m
23. Speciation1h 37m
24. History of Life on Earth2h 6m
25. Phylogeny2h 31m
26. Prokaryotes4h 59m
27. Protists1h 12m
28. Plants1h 22m
29. Fungi36m
- Fungi
  19m
- Fungi Reproduction
  17m
30. Overview of Animals34m
- Overview of Animals
  34m
31. Invertebrates1h 2m
32. Vertebrates50m
33. Plant Anatomy1h 3m
34. Vascular Plant Transport1h 2m
- Water Potential
  1h 2m
35. Soil37m
- Soil and Nutrients
  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
- Flowers
  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
38. Animal Form and Function1h 19m
39. Digestive System1h 10m
- Digestion
  1h 3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 49m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System1h 4m
- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
- Neurons and Action Potentials
  1h 8m
- Central and Peripheral Nervous System
  46m
46. Sensory Systems46m
- Sensory System
  46m
47. Muscle Systems23m
- Musculoskeletal System
  23m
48. Ecology3h 11m
49. Animal Behavior28m
- Animal Behavior
  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

43. Endocrine System

Endocrine System

General Biology

43. Endocrine System

Endocrine System

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1:57 minutes

Problem 5

Textbook Question

What do steroid and peptide hormones typically have in common?
a. Their solubility in cell membranes
b. Their requirement for travel through the bloodstream
c. The location of their receptors
d. Their reliance on signal transduction in the cell

Verified step by step guidance

Understand the nature of steroid and peptide hormones: Steroid hormones are lipid-soluble and can pass through cell membranes, while peptide hormones are water-soluble and cannot pass through cell membranes easily.

Consider how hormones travel in the body: Both steroid and peptide hormones need to travel through the bloodstream to reach their target cells.

Analyze the location of hormone receptors: Steroid hormone receptors are typically located inside the cell, while peptide hormone receptors are located on the cell surface.

Examine the process of signal transduction: Peptide hormones rely on signal transduction pathways to relay their message inside the cell, while steroid hormones directly influence gene expression by interacting with intracellular receptors.

Identify the commonality: Both types of hormones require transport through the bloodstream to reach their target cells, making option b the common feature.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Hormone Solubility

Hormone solubility refers to the ability of hormones to dissolve in different environments, such as cell membranes or the bloodstream. Steroid hormones are lipid-soluble, allowing them to pass through cell membranes easily, while peptide hormones are water-soluble and cannot pass through lipid membranes without assistance. Understanding solubility is crucial for determining how hormones interact with cells and tissues.

Hormone Transport in Bloodstream

Both steroid and peptide hormones require transport through the bloodstream to reach their target cells. Steroid hormones often bind to carrier proteins due to their lipid-soluble nature, while peptide hormones, being water-soluble, travel freely in the blood. This transport mechanism is essential for hormone distribution throughout the body and influences their mode of action.

Signal Transduction

Signal transduction is the process by which a cell responds to molecules, such as hormones, that bind to receptors on its surface or inside the cell. Peptide hormones typically bind to cell surface receptors, triggering a cascade of intracellular events, while steroid hormones often pass through the cell membrane to bind to intracellular receptors. This process is vital for converting extracellular signals into appropriate cellular responses.