Cell Physiology

Course Description

Cell Physiology examines the physiology of cell specialisation, with focus on comparative ultrastructure, function and regulation of differentiated cell types.

Within the SCNS taxonomy, PCB is the Process Biology prefix. Daytona State publishes this at 3 credits, offered fall, with BSC1085C or BSC1010C as prerequisite. ⚠ The single term of offering is worth planning around.

The organising question of this course is how cells with identical genomes become radically different from one another, and what each specialisation costs. A neuron, a muscle fibre, a red blood cell and a secretory cell all carry the same instructions and have made very different bargains — the red blood cell discarded its nucleus to carry more haemoglobin and therefore cannot repair itself or divide; the neuron committed to enormous length and became dependent on transport machinery that can fail. Understanding specialisation as a trade-off rather than an achievement is what makes pathology explicable later.

Daytona State does not publish a lecture and laboratory split for this course. It is an unsuffixed lecture course, and the institution's lecture convention is 15 contact hours per credit — PSY1012, AMH2010 and GEB1011 are all live at 3 credits and 45 hours. This course is priced at that convention.

Learning Outcomes

Required Outcomes

• Describe cell structure and the functions of each organelle.
• Relate ultrastructure to specialised function.
• Describe the plasma membrane and its organisation.
• Describe transport across membranes and its energetics.
• Describe membrane potential and its maintenance.
• Describe cell signalling and receptor mechanisms.
• Describe second messenger systems and signal amplification.
• Describe the cytoskeleton and intracellular transport.
• Describe cell motility and its mechanisms.
• Describe cell adhesion, junctions, and the extracellular matrix.
• Describe energy metabolism and mitochondrial function.
• Describe protein synthesis, folding, and trafficking.
• Describe secretion and endocytosis.
• Describe the regulation of gene expression in differentiated cells.
• Describe the cell cycle and its control.
• Describe differentiation and the basis of cell specialisation.
• Describe stem cells and their potential.
• Compare the physiology of major differentiated cell types.
• Describe excitable cells and their distinctive properties.
• Describe secretory and absorptive cell specialisations.
• Describe cell death, both programmed and by injury.
• Describe cellular responses to stress and injury.
• Relate cellular dysfunction to disease processes.
• Interpret experimental evidence in cell physiology.

Optional Outcomes

• Describe cancer cell biology.
• Describe cellular ageing and senescence.
• Describe immunological cell function in depth.
• Describe experimental techniques in cell biology.
• Describe pharmacological intervention at the cellular level.
• Describe cellular bioenergetics in greater depth.

Major Topics

Required Topics

• Cell structure and organelles
• Ultrastructure and function
• The plasma membrane
• Membrane transport and energetics
• Membrane potential
• Cell signalling and receptors
• Second messengers and amplification
• Cytoskeleton and intracellular transport
• Cell motility
• Adhesion, junctions, and matrix
• Energy metabolism and mitochondria
• Protein synthesis and trafficking
• Secretion and endocytosis
• Regulation of gene expression
• The cell cycle
• Differentiation
• Stem cells
• Comparative cell physiology
• Excitable cells
• Secretory and absorptive specialisation
• Cell death
• Responses to stress and injury
• Cellular basis of disease
• Interpreting experimental evidence

Optional Topics

• Cancer cell biology
• Ageing and senescence
• Immunological cell function
• Experimental techniques
• Pharmacological intervention
• Bioenergetics

Resources & Tools

• Your college library's science databases — free with enrolment, and the difference between citing the literature and citing a website.
• Your instructor's office hours — free, underused, and the fastest route past a concept you are stuck on.
• The tutoring centre — free, and used most heavily by the students who do best.
• Draw the mechanism yourself. Concept maps and hand-drawn diagrams outperform rereading substantially in science courses, and they show you where the gap is.
• Work problems continuously rather than before assessments. Science and mathematics are learned by doing, and reading a worked solution produces a convincing but false sense of understanding.
• NCBI Bookshelf (ncbi.nlm.nih.gov/books) — free full-text access to major cell and molecular biology textbooks; an outstanding and under-used resource.
• PubMed — free; and reading a primary paper alongside a textbook chapter is what makes upper-division science different from lower-division.

Career Pathways

• Biological technician — SOC 19-4021.
• Medical laboratory technologist — SOC 29-2011; separately credentialed.
• Research laboratory positions in academic, hospital, and biotechnology settings.
• Pharmaceutical and biotechnology industry — a growing Florida sector.
• Preparation for professional health programmes — medicine, dentistry, pharmacy, physician assistant and veterinary medicine all build on this material.
• Secondary school science teaching — SOC 25-2031, with teacher certification.
• Transfer to a bachelor's or graduate programme in biology or a biomedical science.
• ⚠ Research careers in this field generally require a graduate degree — plan the pathway rather than assuming a bachelor's is the destination.

Special Information

⚠ Specialisation is a trade-off — and the trade-offs explain the pathology

• Every specialised cell has given something up to become good at one thing, and the thing it gave up is usually where it becomes vulnerable.
• The red blood cell is the clearest case: no nucleus and no mitochondria means maximum haemoglobin, and it means the cell cannot repair itself, cannot divide, and depends entirely on anaerobic metabolism.
• ⚠ Neurons committed to extreme length and to electrical excitability, which makes them dependent on continuous transport along the axon and on an oxygen supply they cannot buffer — which is why neurological tissue is the first to fail when perfusion stops.
• Cardiac and skeletal muscle made different bargains about fatigue resistance, regeneration, and energy source, and those bargains show up directly in how each responds to injury.
• Secretory cells invest enormously in synthetic machinery, which makes them sensitive to disruption of protein folding and trafficking.
• Ask what each specialisation costs as you meet it. It converts a list of cell types into a set of predictions.
• Relate structure to function every time. Ultrastructure is not decoration — surface area, organelle density, and cytoskeletal arrangement follow directly from what the cell does.
• ⚠ This is the mechanistic foundation for pathophysiology, which is where these ideas are used clinically — see this repository's HSC4550 guide.

⚠⚠ Report what you measured, not what you expected

• Results that disagree with the prediction are the interesting ones, and explaining the disagreement is the scientific work. Treating it as a mistake to be hidden is backwards.
• ⚠⚠ Never adjust data toward the expected answer, and never quietly drop an inconvenient reading. In coursework it is academic misconduct; in professional practice it is research fraud, and it ends careers.
• Record what you actually did, including the mistakes and the deviations from the protocol. A method section that describes an idealised procedure nobody followed is not reproducible.
• Quantify uncertainty rather than describing it. "Within experimental error" means nothing without the error.
• Distinguish systematic from random discrepancy. A consistent offset points at calibration or a modelling assumption; scatter points at technique.
• Say what your data cannot tell you. Stating a limitation is a strength, and overclaiming is the failure that damages credibility fastest.
• ⚠ Correlation is not causation, and an observational result is not an experimental one — this is where most over-interpretation of biological and environmental data happens.
• Keep a legible notebook. Contemporaneous notes are the record; reconstructed ones are a story.

How Florida course levels affect transfer

The first digit of an SCNS number denotes the year of offering, not transferability. Courses at the 1000 and 2000 levels transfer transparently between Florida public institutions, and 3000 to 4000 is unproblematic since both are upper division. The boundary that actually matters is 2000 to 3000, where lower-division credit generally cannot satisfy an upper-division requirement.

PCB3203 is 3 credits and approximately 45 contact hours, offered fall only at Daytona State.