Midtermreviewanswers15
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This document provides information on multiple topics related to biology and the scientific process. It discusses key elements of experiments like placebos, informed consent, and sample size. It also defines important scientific terms like dependent variable, independent variable, and constant variable. Additionally, it outlines the structure and functions of major body systems like the skeletal system, circulatory system, respiratory system, and digestive system. It explains cellular structures and compares bacterial and animal cells. The document covers a wide range of biological concepts in a descriptive manner.
Midtermreviewanswers15
- 1. 1. Multiple trials 2. Placebo (fake medicine) 3. Informed consent (permission slip) 4. Large sample size 5. Well written procedure Quantitative= number data Qualitative= description data DV= data; Heart rate IV= change you make, “push-ups” Constant variable= what stays the same for each person; “type of exercise”
- 2. -Certain nutrients can keep you healthy - not all diseases are caused by germs - well designed experiments are important! Sensory Neurons sense the environment and send the signals to your brain. -1) structure 2) protection of organs 3) bone marrow creates blood cells 4) helps you move 5) store minerals
- 3. Tendons connect muscle to bone Ligaments connect bone to bone 1) cardiac muscle- heart 2) skeletal- moves your skeleton 3) Smooth- lines your digestive tract; is automatic -transports oxygen and nutrients and removes wastes and carbon dioxide from your body -heart pumps the blood: right side to lungs alveoli in lungs allow CO2 and O2 exchange left side of heart to
- 4. body! (double pump) Arteries- take blood away from the heart Veins- bring blood to the heart Capillaries- small blood vessels where oxygen and CO2 and nutrients can be exchanged Nose/mouth Trachea (wind pipe) Bronchial tubes- branches Alveoli- grape like/ tiny Alveoli allow the oxygen and carbon dioxide to exchange in your blood.
- 5. Heart pumps the blood with oxygen all over the body (from the left side) 1)mouth 2) esophagus 3) stomach 4) small intestine 5) large intestine ------ 1)mouth- mechanical / chemical 2) esophagus- neither 3) stomach- mechanical / chemical 4) small intestine- chemical 5) large intestine- reabsorbs water
- 6. cells tissues organs organ systems organism pulse- number of times your heart beats in a period of time (beats per minute) High power trade off- (less area- hard to find things) Low power trade offs- (less detail) Nucleus- controls all cell activities (brain) Cell Membrane- controls what enters and leaves the cell.
- 7. Cytoplasm- a gel like material that fills the cell and all organelles float in. Mitochondria- provide power to the cell (via cellular respiration) Bacteria vs. animal cell Bacteria has NO NUCLEUS Bacteria has a cell wall Both have everything else. Multicellular – bigger, live longer, specialized cells