BackMrs. Delancy went to the local meat market and bought a beef tenderloin (cut from the loin, the region along the steer's caudal vertebral column) and some tripe (cow's stomach). What type of muscle was she preparing to eat in each case?
Jesse is a 2-year-old boy who presents with difficulty in walking and poor control of movements. When the doctor examines Jesse, she notices that when his muscles contract, they are very slow to relax and remain contracted well after the movement has been performed. She sends a sample of his tissue for genetic analysis, and the lab reports a genetic defect that causes the pumps in the SR to operate much more slowly than normal. How does a defect in DNA lead to a malfunctioning protein? How does this finding explain Jesse's symptoms?
Use the key to classify each of the following described tissue types into one of the four major tissue categories.
Key:
a. Connective tissue
b. Epithelium
c. Muscle
d. Nervous tissue
_________ (1) Tissue type composed largely of nonliving extracellular matrix; important in protection and support
_________ (2) The tissue immediately responsible for body movement
_________ (3) The tissue that enables us to be aware of the external environment and to react to it
_________ (4) The tissue that lines body cavities and covers surfaces
Ms. Sanchez was in a motorcycle accident in which she lost the use of her right upper limb muscles due to significant nerve damage. However, when an electrode is inserted into her muscles, they are able to contract. Explain specifically why nerve damage caused her to lose the use of her muscles. Why can they still respond to stimulation from an electrode?