General
Negative feedback is the dominant control mechanism. Positive feedback is uncommon and self-amplifying; estrogen-triggered LH surge before ovulation is the classic example.
Library
All notes
148 notes
Blood
Haematocrit (Hct) is the percentage of blood volume occupied by RBCs. Plasma is approximately 92% water.
Last Day Revision
Sensitivity order: C > B > A-δ > A-α — pain fibres generally blocked before large motor fibres. Stimulus → Receptor → Afferent pathway → Integrating centre → Efferent pathway → Effector → Response.
Muscle
Whole muscle → fascicles → muscle fibres → myofibrils → myofilaments. The collagen fibres of these coverings blend with tendon collagen, transmitting muscle force to bone.
Body Fluids
FCPS pearl: TBW percentage depends on age, sex and body composition, so the 60% rule is an approximation, not a universal value.
Cell
The plasma membrane is a fluid phospholipid bilayer that separates the intracellular and extracellular environments and selectively controls movement of substances.
Nerve Membrane
The cell membrane is a phospholipid bilayer. Because its core is hydrophobic, charged ions cannot freely cross it and require specific membrane proteins.
Introduction
I am 2025 BDS graduate and attempted for FCPS part 1 in October 2026 as my first try and Allhumdullilah I passed.
