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Biology
Grade college
Human Anatomy and Physiology Systems Reference Cheat Sheet
A printable reference covering organ systems, homeostasis, cardiovascular equations, respiratory volumes, renal clearance, and endocrine feedback for college biology.
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Human anatomy and physiology connects body structures with the functions that keep cells alive. This cheat sheet gives college students a compact reference for the major body systems, their core roles, and the relationships used most often in introductory physiology. It is useful for reviewing how organs work together during homeostasis, exercise, disease, and clinical measurements.
Key Facts
- Homeostasis is maintained by negative feedback loops in which a sensor detects a change, a control center compares it with a set point, and an effector produces a response.
- Cardiac output is calculated as CO = HR x SV, where HR is heart rate and SV is stroke volume.
- Mean arterial pressure is estimated as MAP = CO x TPR, where TPR is total peripheral resistance.
- Alveolar ventilation is calculated as VA = (TV - dead space) x respiratory rate, where TV is tidal volume.
- Glomerular filtration rate can be estimated by clearance using C = (U x V) / P, where U is urine concentration, V is urine flow rate, and P is plasma concentration.
- The nervous system uses rapid electrical and chemical signaling, while the endocrine system uses slower hormone signaling through the bloodstream.
- The digestive system breaks food into absorbable molecules, and the hepatic portal system carries many absorbed nutrients to the liver before they enter systemic circulation.
- The immune system uses innate defenses for fast nonspecific protection and adaptive defenses for specific memory-based responses.
Vocabulary
- Homeostasis
- Homeostasis is the maintenance of relatively stable internal conditions despite changes inside or outside the body.
- Negative feedback
- Negative feedback is a control process in which the response reduces the original stimulus and moves a variable back toward its set point.
- Cardiac output
- Cardiac output is the volume of blood pumped by one ventricle each minute.
- Tidal volume
- Tidal volume is the amount of air moved into or out of the lungs during one normal quiet breath.
- Glomerular filtration rate
- Glomerular filtration rate is the volume of fluid filtered from glomerular capillaries into the kidney tubules each minute.
- Hormone
- A hormone is a chemical messenger released by endocrine cells that travels in blood to affect target cells with specific receptors.
Common Mistakes to Avoid
- Confusing negative feedback with a negative outcome is wrong because negative feedback means the response opposes the initial change, even when the effect is beneficial.
- Treating cardiac output and stroke volume as the same value is wrong because cardiac output is the total blood pumped per minute, while stroke volume is blood pumped per beat.
- Ignoring anatomical position is wrong because body direction terms such as medial, lateral, anterior, and posterior are defined relative to the standard anatomical position.
- Mixing up ventilation and respiration is wrong because ventilation is air movement into and out of the lungs, while respiration can refer to gas exchange or cellular ATP production.
- Assuming all hormones act quickly is wrong because many endocrine effects depend on receptor type, and steroid hormone responses often require changes in gene expression.
Practice Questions
- 1 A patient has a heart rate of 72 beats/min and a stroke volume of 70 mL/beat. What is the cardiac output in L/min?
- 2 A student has a tidal volume of 500 mL, an anatomical dead space of 150 mL, and a respiratory rate of 12 breaths/min. What is the alveolar ventilation in mL/min?
- 3 A substance has a urine concentration of 120 mg/mL, a urine flow rate of 1.5 mL/min, and a plasma concentration of 3 mg/mL. What is its renal clearance in mL/min?
- 4 Explain why the cardiovascular and respiratory systems must work together to maintain oxygen delivery during exercise.