生理学

The core task of this step is to select an important physiological system and design a scientific experimental protocol to study its functional regulation mechanism. Choose a representative function from nervous, muscular, blood, circulatory, respiratory, digestive, urinary, or endocrine systems for experimental study. Experimental design should follow scientific principles of control, randomization, and replication.

• Choose a research topic from cardiovascular regulation (baroreflex, heart rate variability), respiratory regulation (pulmonary ventilation, blood gas changes), neuro-muscular physiology (EMG, muscle contraction), urinary system (urine formation regulation), etc.
• Experimental design: determine experimental subjects (human or lab animals), experimental and control groups (self-control or inter-group control), observation indicators (heart rate, blood pressure, respiratory rate, tidal volume, EMG, etc.), experimental workflow and data collection plan
• List experimental equipment: physiological signal acquisition system (PowerLab/BL-420), pressure transducer, respiration transducer, needle electrodes, ECG electrodes, etc.; include experimental procedures and safety precautions

The core task of this step is to complete all pre-experiment preparations and calibrate experimental instruments to ensure smooth experiment execution and reliable data. Physiology experiments require high instrument precision and operational standardization. Accurate instrument calibration is prerequisite for reliable data. Adequate preparation directly affects experiment success.

• Instrument preparation and calibration: connect physiological signal acquisition system with various transducers; power on and warm up; calibrate blood pressure transducer (with mercury sphygmomanometer), respiratory flow sensor, bioelectric amplifier; set sampling rate (e.g., 1000Hz) and filtering parameters
• Subject preparation: for human experiments, subjects sign informed consent; measure height, weight, baseline BP and HR; for animal experiments, perform anesthesia (20% urethane 5ml/kg i.p.), surgery (tracheal intubation, carotid artery cannulation, vagus nerve isolation, etc.)
• Pilot test: conduct short pilot experiment; observe signal quality; adjust electrode positions and gain parameters; ensure clear and stable signals; eliminate interfering factors

The core task of this step is to perform standard operations according to experimental protocol and systematically collect physiological data. During experiments, strictly control experimental conditions, avoid interfering factors, and ensure data accuracy and reproducibility. Each experimental condition requires multiple repetitions, and each measurement needs sufficient recording time.

• Baseline state recording: record baseline values of all physiological indicators at rest (HR, BP, respiratory rate, ECG, etc.); record continuously for 5-10 minutes; use stable period data as control
• Experimental intervention and recording: apply intervention factors according to protocol (postural change, exercise load, Valsalva maneuver, carotid sinus massage, drug injection, hypoxic stimulus, etc.); synchronously record dynamic changes of all physiological indicators
• Parallel control and replication: repeat each intervention 3 times; set appropriate recovery intervals; record experimental phenomena and abnormal situations; make notes in lab notebook promptly

The core task of this step is to systematically process and analyze collected physiological data, explain experimental results using physiological principles, and clarify functional regulation mechanisms. Data processing requires professional physiological signal analysis software to extract characteristic parameters and perform statistical analysis. Mechanism analysis should integrate basic physiological theories of neural, humoral, and autoregulation.

• Data preprocessing: use physiological signal analysis software (LabChart, Matlab) for filtering, detrending, segmenting raw data; extract valid data segments
• Parameter extraction and statistics: calculate mean and standard deviation of each indicator, such as heart rate variability (HRV) time and frequency domain parameters, systolic/diastolic/mean arterial pressure, tidal volume/minute ventilation; perform paired t-test or ANOVA
• Mechanism analysis: explain experimental results using physiological principles; analyze regulatory mechanisms (neural regulatory pathways, humoral factor effects, negative feedback processes); draw regulatory mechanism block diagrams

The core task of this step is to write a complete physiology experiment report systematically presenting experimental design, methods, data results, and mechanism analysis. The report should demonstrate scientific rigor of physiology experiments and discuss physiological significance and clinical application value of results. Lab report is a comprehensive manifestation of scientific research ability.

• Write according to physiology lab report standards: abstract, introduction, materials and methods, experimental results, analysis and discussion, conclusion, references; minimum 3000 words
• Create high-quality result figures: raw physiological recording traces (with key events labeled), statistical bar/line charts (with error bars), mechanism diagrams; clear and standard figure/table captions
• In-depth discussion: analyze consistency between results and theoretical expectations; discuss influencing factors and error sources; compare differences under different experimental conditions; connect to clinical applications (cardiovascular diseases, respiratory insufficiency); propose improvement suggestions

Select physiological system and design experiment

Conduct physiology experiments and collect signals

Process signals and calculate key indicators

Analyze regulatory mechanisms and factors

Write complete experimental report