1. a. The action potential changes the membrane potential from -70 mV (resting) to +30 mV and back again to the resting membrane potential. b. This results from a change in membrane permeability first to Na then to K due to the opening of what type of ion channels? Voltage gated channels 2. a. Where is the density of voltage-gated Na+ channels the greatest? Axon hillock b. What areas of the neuron generate signals that open these voltage-gated channels? Dendrites and the cell body c. Opening
Premium Action potential Neuron
WHAT IS SEX ‚ HUMAN SEXUALITY‚ SEX HORMONES AND SEXUALLY TRANSMITTED HORMONES Table of Contents Introduction3 What is human sexuality3 1. Biological dimension………………………………………..4 2. Psychological dimension……………………………………4 3. Sociocultural dimension…………………………………….4 Sex hormones……………………………………………………………5 Human sexual response cycle6 i. Excitement……………………………………………………...7 ii. Plateau………………………………………………………….8 iii. Orgasm…………………………………………………………8 iv. Resolution………………………………………………………9
Free Sexual intercourse Human sexuality Sexual arousal
Hypothyroidism Hypothyroidism is a condition where the thyroid does not produce enough of the hormones that are required to maintain metabolism (Harvard School of Medicine‚ 2007). Introduction Hypothyroidism is not a disease itself‚ but is a condition that a disease state causes (Buckley & Schub‚ 2008). Many of the causes of hypothyroidism are related to autoimmune conditions‚ where the body attacks itself‚ rendering the thyroid useless (Raisbeck‚ 2009). In fact‚ this is the most common cause
Premium Thyroid Thyroid-stimulating hormone Hyperthyroidism
Natural Sciences‚ Assumption College‚ Worcester‚ MA‚ USA. [pic] Background Smooth muscle is one of three muscle fiber types found in animals. Unlike skeletal and cardiac muscle cells‚ smooth muscle cells are not striated‚ and have single nuclei. Smooth muscles are typically under control of the autonomic nervous system‚ and do not contract voluntarily. Smooth muscle contracts slowly‚ and does not exhibit the characteristic “twitch” seen in skeletal muscle. In addition‚ smooth muscle is not prone
Premium Cardiac muscle Skeletal muscle Muscle contraction
between cells. Cell communication is a crucial process necessary for cells to carry out various functions. Drugs such as Methylenedioxymethamphetamine (MDMA)‚ known as ecstasy‚ can create barriers or confusion to cells. Cell to cell communication carry messages from signaling cells to target cells. Usually a cell will bind with a target cell through a receptor protein in the plasma membrane of the target cell
Premium Psychology Sociology English-language films
The Immune System: Anatomy Review 1. Name the two major anatomical parts of the immune system: • ________________________________________ • ________________________________________ 2. Cells of the immune system originate in ___________. These cells are called ______________ when traveling in the blood and are classified according to the shape of their nucleus and colors of their granules when stained. 3–4. List the leukocytes in order of frequency from most to least common. In the second column
Premium Lymphatic system Immune system White blood cell
Chapter 1: The Human Body: An Orientation Chapter Practice Test This activity contains 20 questions. Which of the following best defines physiology? The study of all chemical reactions that occur within body cells. The study of how the body parts work and carry out their life-sustaining activities. The study of tissues. The study of the structure of body parts and their relationships to one another. Which of the following best describes macroscopic anatomy? The study
Premium Anatomy Heart
this is "Natural Human Growth Hormone" As we grow‚ our body faces a major physical change which consists of both positive and negative effects which directly affects us on our living. Growth of human hormones is one of the most important factors which devalue on as we become older. The process of aging is directly related to human growth‚ which is created by a pituitary gland‚ the master gland of the endocrine system. The human growth hormones play a vital role in the development of our body
Premium Growth hormone Immune system
Cells Cells Cell division and cancer Victoria Brothwell Strayer University Cells Introduction Regular cells and cancel cells are extremely different. Depending on the cancer that one may have cancer cells have more chromosomes that are scattered which is for why cancer cells are formed. In cell division all living things obtain cells in which come from other preexisting cells. If normal cells are do not divide and make new cells then cancer will occur. In order of all cells to be
Premium Cell cycle Cancer Mitosis
growth of abnormal cells in the body. When cells in part of the body become overactive‚ cancer begins. Many kinds of cancer start because of the out of control growth of abnormal cells. How can you prevent cancer? Research shows that there are ways to prevent cancer. Avoiding smoking cigarettes and exposure to smoke will decrease the chances of getting lung cancer. Fruits‚ vegetables and a well balanced diet are important to keep healthy and will help repair damaged cells. Colleen Huber stated
Premium Cancer Immune system Chemotherapy