A patient comes to the doctor’s office complaining they often feel weak and unable to complete daily tasks like going up and down stairs or sweeping the floor without becoming tired and out of breath. The doctor asks the patient a number of questions and runs several tests to try to determine what is wrong. Which of the following best explains why a patient admitted to the hospital would complain of shortness of breath and extreme fatigue while completing daily activities? A.

An intestinal parasite is affecting digestion, keeping food from the excretory system when it gets rid of waste.
B.

A heart defect is affecting circulation, keeping the nervous system from sending signals to the body.
C.

A respiratory infection is affecting breathing, keeping oxygen from getting to muscle cells, preventing them from being able to move the body as well.
D.

A pulled muscle is affecting movement, keeping the cardiovascular system from delivering blood to the body.

PLEASE HELP AS FAST AS YOU CAN :C

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/