Washington State University - Pullman Campus

BIOLOGY 251 EXAM 4 QUESTIONS AND 100% CORRECT ANSWERS LATEST 2026/27 UPDATE - WSU

BIOLOGY 251 EXAM 3 QUESTIONS AND 100% CORRECT ANSWERS LATEST 2026/27 UPDATE - WSU

BIOLOGY 251 EXAM 2 QUESTIONS AND 100% CORRECT ANSWERS LATEST 2026/27 UPDATE - WSU

BIOLOGY 251 EXAM 1 QUESTIONS AND 100% CORRECT ANSWERS LATEST 2026/27 UPDATE - WSU

Biology 102 Chapter 25 notes on homeostasis, the endocrine system, and the immune system. Covers hormone signaling, target cells, negative and positive feedback, the fight or flight response, pathogen defenses, innate and adaptive immunity, white blood cells, antibodies, and antigens.

Biology 102 Chapter 24 notes on human physiology, covering the circulatory system with heart, blood, and vessels; respiratory system and gas exchange; urinary system with kidney function and nephron processes; and nervous system including neurons, sensory receptors, CNS, PNS, and reflexes.

Biology 102 Chapter 23 notes on human nutrition and digestion, covering macronutrients, micronutrients, and essential nutrients. Explains food processing through ingestion, digestion, absorption, and elimination, detailing the structure and function of the oral cavity, pharynx, esophagus, stomach, small intestine (duodenum, jejunum, ileum), and large intestine, including nutrient absorption, enzyme activity, bile, villi, and microbiome fermentation.

Biology Chapter 22 notes on homeostasis and human organ systems, covering tissue types, 11 organ systems, and processes that maintain internal conditions. Includes feedback mechanisms, gametogenesis, meiosis, the ovarian cycle, fertilization, zygote development, cleavage, gastrulation, and stages of embryonic growth and childbirth.

Biology 102 Chapters 18 & 20 notes on ecology, covering levels of ecological research, biotic and abiotic factors, weather and climate, global cycles including water and carbon, climate change, and human impacts. Explains community ecology, species diversity, trophic structure, food chains and webs, keystone species, interspecific interactions like competition, predation, mutualism, commensalism, ecological niches, and predator-prey adaptations.

Biology 102 Chapter 17 notes on animal diversity, covering major animal groups, body symmetry, early development, and key traits of each phylum. Includes sponges, cnidarians, flatworms, mollusks, annelids, nematodes, arthropods, echinoderms, and chordates, explaining features like molting, segmentation, water-vascular systems, vertebrate evolution, and adaptations from fish to mammals.