ENDO 1 : PART 2 EXAMS WITH 100% ACCURATE
ANSWERS LATEST DOWNLOADED 2025/2026 A
COMPLETE SOLUTION BEST GRADED A+ FOR
SUCCESS
How much hormone concentration is required to control
metabolic functions?
Incredibly small amounts, from as little as 1 picogram (one-
trillionth of a gram) to a few micrograms per mL of blood.
Which hormones are water-soluble?
Peptides and catecholamines.
How are water-soluble hormones transported in the blood?
Dissolved freely in plasma.
How do water-soluble hormones reach target cells?
They diffuse out of capillaries into interstitial fluid to reach
target cells.
Which hormones are lipid-soluble?
Steroids and thyroid hormones.
How are lipid-soluble hormones transported in the blood?
Bound to plasma proteins.
What percentage of lipid-soluble hormones exist free in the
blood?
, ENDO 1 : PART 2 EXAMS WITH 100% ACCURATE
ANSWERS LATEST DOWNLOADED 2025/2026 A
COMPLETE SOLUTION BEST GRADED A+ FOR
SUCCESS
Less than 10 percent exist free.
What percentage of T4 is protein-bound?
Greater than 99 percent of T4 is protein-bound.
Are bound hormones biologically active or inactive?
Bound hormones are biologically inactive.
What is the function of protein-bound hormones in the blood?
They serve as reservoirs, replenishing free hormone levels.
How does binding to plasma proteins affect hormone
clearance?
It greatly slows their clearance from the blood.
What is the first step of hormone action?
Binding to specific receptors at the target cell.
What does hormone binding to a receptor trigger?
A cascade of reactions where each stage becomes more
powerfully activated.
Where are receptors for proteins peptides and catecholamines
located?
ANSWERS LATEST DOWNLOADED 2025/2026 A
COMPLETE SOLUTION BEST GRADED A+ FOR
SUCCESS
How much hormone concentration is required to control
metabolic functions?
Incredibly small amounts, from as little as 1 picogram (one-
trillionth of a gram) to a few micrograms per mL of blood.
Which hormones are water-soluble?
Peptides and catecholamines.
How are water-soluble hormones transported in the blood?
Dissolved freely in plasma.
How do water-soluble hormones reach target cells?
They diffuse out of capillaries into interstitial fluid to reach
target cells.
Which hormones are lipid-soluble?
Steroids and thyroid hormones.
How are lipid-soluble hormones transported in the blood?
Bound to plasma proteins.
What percentage of lipid-soluble hormones exist free in the
blood?
, ENDO 1 : PART 2 EXAMS WITH 100% ACCURATE
ANSWERS LATEST DOWNLOADED 2025/2026 A
COMPLETE SOLUTION BEST GRADED A+ FOR
SUCCESS
Less than 10 percent exist free.
What percentage of T4 is protein-bound?
Greater than 99 percent of T4 is protein-bound.
Are bound hormones biologically active or inactive?
Bound hormones are biologically inactive.
What is the function of protein-bound hormones in the blood?
They serve as reservoirs, replenishing free hormone levels.
How does binding to plasma proteins affect hormone
clearance?
It greatly slows their clearance from the blood.
What is the first step of hormone action?
Binding to specific receptors at the target cell.
What does hormone binding to a receptor trigger?
A cascade of reactions where each stage becomes more
powerfully activated.
Where are receptors for proteins peptides and catecholamines
located?
