i told my friend something and told her not to tell anyone she went behind my back and told someone anyway. i got in a lot of trouble and keep making the same mistake by telling her more secrets. My sister and i are arguing every day non stop and she always says hurtful stuff. my twin brothers just got out of juvenile and they are on a monitor they aren't suppose to have friends over but they do. My grandparents are always arguing or dealing with my brothers so they don't have time for us. my mom doesn't even notice us. my younger sister is the only one i can talk to and she is sad that her dad left when she was 4 or 5.what should i do

Muscles in the body us with a lot of things for example, if i wanted to lift a heavy box and had no muscle i would just collapse where i was because of the fact muscles hold us together. overall they are 650 muscle in the human body, all of them have different purposes and ways to keep us together. there are three types of muscle in the body skeletal, smooth, and cardiac muscle. skeletal muscle are attached to the bone and with movement. smooth muscle, this is found in the wall of our organs, such as our stomach, this muscle with movement   as well, without this muscle, we would only be allowed to eat small amounts. the cardiac muscle is the heart muscle and probably the most important one. these are only found in the walls of the heart and the heart pump blood to the other parts of your body. we have two different types of muscle fibers, slow twitch and fast twitch. slow twitch muscles enable long-endurance feats such as distance running. fast twitch fatigue faster but are used in powerful bursts of movements like sprinting. there are three different types of muscle contractions concentric, eccentric, isometric. concentric contraction causes muscles to shorten, thereby generating force.   eccentric contractions cause muscles to elongate in response to a greater opposing force. isometric contractions generate force without changing the length of the muscle.: //athleticquickness.com/muscle-contraction-types-part-1/

The human reproductive system uterusthe bird reproductive system eggs dropped