Chapter 2: Foundational Medical Sciences
1. Why Do We Need Medical Sciences as Nurses?
I used to think doctors need all the science and nurses just need to be kind. But this chapter
made it clear. Without medical sciences, a nurse cannot understand why a patient has a fever,
why a wound is turning black, or why a heart is beating too fast. Medical sciences are the why
behind nursing actions. If a patient has low blood pressure, I need to know basic anatomy
(which blood vessels?) and basic pharmacology (what drug raises BP?) to act correctly. Nursing
without science is just guessing.
2. The Main Sciences We Must Know
The chapter breaks foundational medical sciences into several branches. Each one connects
directly to bedside care.
A. Anatomy and Physiology (Structure and Function)
Anatomy is the study of body parts. Physiology is how those parts work. You cannot separate
them.
What I need to know as a student nurse:
Location of major organs. Heart is in the chest, slightly left. Liver is under the right rib cage.
Kidneys are in the lower back.
Basic body systems: cardiovascular (heart and blood vessels), respiratory (lungs and airways),
nervous (brain and nerves), digestive, urinary, musculoskeletal, endocrine (hormones),
immune, integumentary (skin).
Example from chapter: If a patient has a wound on the lower leg, I need to know that the tibia
bone is right under the skin there. A deep wound can expose bone. That is anatomy. Physiology
tells me that poor blood flow in the leg veins will slow healing.
B. Microbiology (The Invisible World)
Microbiology is the study of tiny living things: bacteria, viruses, fungi, parasites. As a nurse, I
need this to prevent infections.
Key points I noted:
Not all bacteria are bad. Normal flora lives on our skin and in our gut and protects us.
, Pathogens are the bad ones that cause disease. Examples: E. coli (causes diarrhea), Staph
aureus (causes wound infections), influenza virus (causes flu).
Chain of infection: pathogen -> reservoir (place it lives) -> exit from host -> transmission ->
entry to new host -> susceptible person. Break any link and infection stops. Hand hygiene
breaks transmission.
Hospital-acquired infections (HAIs) are a big danger. A nurse who knows microbiology will clean
wounds properly, sterilize equipment, and isolate contagious patients.
C. Pharmacology (How Drugs Work)
Pharmacology is the study of medicines. A nurse gives dozens of drugs. Without pharmacology,
that is dangerous.
What the chapter taught me:
Generic name vs brand name. Generic is the chemical name (ibuprofen). Brand is the company
name (Advil). Use generic in hospital.
Absorption, distribution, metabolism, excretion (ADME). How a drug enters the body, travels,
gets broken down (mostly liver), and leaves (mostly kidneys).
Side effects vs adverse effects. Side effects are mild and expected (drowsiness from allergy
meds). Adverse effects are harmful and serious (bleeding from blood thinners).
Right drug, right dose, right patient, right route, right time, right documentation. These six
rights prevent errors.
Drug interactions: Some drugs cancel each other. Some increase effects dangerously. Always
check.
D. Pathophysiology (What Goes Wrong)
Pathophysiology is the study of disease. How a healthy body becomes sick. This chapter says
pathophysiology is the bridge between normal science and nursing care.
Examples from my notes:
Inflammation: When tissue is injured, the body sends blood and white cells. Signs are redness,
heat, swelling, pain, loss of function. This is normal. But too much inflammation damages
organs.
Fever: Body raises temperature to kill germs. A low fever is helpful. A very high fever (above
104 F or 40 C) can cause brain damage.
Shock: Not enough blood flow to organs. Causes include bleeding, heart attack, severe
infection. Signs are fast pulse, low BP, cold skin, confusion. A nurse must recognize shock early.
Diabetes: Pancreas does not make enough insulin or cells ignore insulin. Blood sugar rises. Over
time, this damages eyes, kidneys, nerves, and blood vessels.
E. Chemistry (Relevant Parts Only)
1. Why Do We Need Medical Sciences as Nurses?
I used to think doctors need all the science and nurses just need to be kind. But this chapter
made it clear. Without medical sciences, a nurse cannot understand why a patient has a fever,
why a wound is turning black, or why a heart is beating too fast. Medical sciences are the why
behind nursing actions. If a patient has low blood pressure, I need to know basic anatomy
(which blood vessels?) and basic pharmacology (what drug raises BP?) to act correctly. Nursing
without science is just guessing.
2. The Main Sciences We Must Know
The chapter breaks foundational medical sciences into several branches. Each one connects
directly to bedside care.
A. Anatomy and Physiology (Structure and Function)
Anatomy is the study of body parts. Physiology is how those parts work. You cannot separate
them.
What I need to know as a student nurse:
Location of major organs. Heart is in the chest, slightly left. Liver is under the right rib cage.
Kidneys are in the lower back.
Basic body systems: cardiovascular (heart and blood vessels), respiratory (lungs and airways),
nervous (brain and nerves), digestive, urinary, musculoskeletal, endocrine (hormones),
immune, integumentary (skin).
Example from chapter: If a patient has a wound on the lower leg, I need to know that the tibia
bone is right under the skin there. A deep wound can expose bone. That is anatomy. Physiology
tells me that poor blood flow in the leg veins will slow healing.
B. Microbiology (The Invisible World)
Microbiology is the study of tiny living things: bacteria, viruses, fungi, parasites. As a nurse, I
need this to prevent infections.
Key points I noted:
Not all bacteria are bad. Normal flora lives on our skin and in our gut and protects us.
, Pathogens are the bad ones that cause disease. Examples: E. coli (causes diarrhea), Staph
aureus (causes wound infections), influenza virus (causes flu).
Chain of infection: pathogen -> reservoir (place it lives) -> exit from host -> transmission ->
entry to new host -> susceptible person. Break any link and infection stops. Hand hygiene
breaks transmission.
Hospital-acquired infections (HAIs) are a big danger. A nurse who knows microbiology will clean
wounds properly, sterilize equipment, and isolate contagious patients.
C. Pharmacology (How Drugs Work)
Pharmacology is the study of medicines. A nurse gives dozens of drugs. Without pharmacology,
that is dangerous.
What the chapter taught me:
Generic name vs brand name. Generic is the chemical name (ibuprofen). Brand is the company
name (Advil). Use generic in hospital.
Absorption, distribution, metabolism, excretion (ADME). How a drug enters the body, travels,
gets broken down (mostly liver), and leaves (mostly kidneys).
Side effects vs adverse effects. Side effects are mild and expected (drowsiness from allergy
meds). Adverse effects are harmful and serious (bleeding from blood thinners).
Right drug, right dose, right patient, right route, right time, right documentation. These six
rights prevent errors.
Drug interactions: Some drugs cancel each other. Some increase effects dangerously. Always
check.
D. Pathophysiology (What Goes Wrong)
Pathophysiology is the study of disease. How a healthy body becomes sick. This chapter says
pathophysiology is the bridge between normal science and nursing care.
Examples from my notes:
Inflammation: When tissue is injured, the body sends blood and white cells. Signs are redness,
heat, swelling, pain, loss of function. This is normal. But too much inflammation damages
organs.
Fever: Body raises temperature to kill germs. A low fever is helpful. A very high fever (above
104 F or 40 C) can cause brain damage.
Shock: Not enough blood flow to organs. Causes include bleeding, heart attack, severe
infection. Signs are fast pulse, low BP, cold skin, confusion. A nurse must recognize shock early.
Diabetes: Pancreas does not make enough insulin or cells ignore insulin. Blood sugar rises. Over
time, this damages eyes, kidneys, nerves, and blood vessels.
E. Chemistry (Relevant Parts Only)
