Which organ system sends signals to your blood vessels to cause them to contract or expand?

The drift speed of electrons that make up current in a circuit is

The cardiovascular system consists of the  _______ circulation (conveys arterial blood from the heart to the lungs and returns venous blood back to the heart) and  _______ circulation (conveys arterial blood from the heart to all other tissues and returns venous blood back to the heart).

Match the Cartilage image with the correct cartilage name:

Bone is a connective tissue characterized by a mineralized extracellular matrix. True or False?

Match the correct cell structure or function to the best answer.

Match the description that identifies each of the photomicrographs below.  

Match the best answer to the definition of Nervous System structure and function:

Haz lo que te digo Your friend is housesitting for you while you are away for spring break. Complete each of your instructions to him with the correct informal commandform of the logical verb from the word bank. The verb bank is the same for all questions in this quiz.  Use each choice only once. When required, correctly include the reflexive pronoun. When needed, type one word per answer box.                                                        á   é   í   ó   ú   ñ olvidarse ver poner leer quedarse recoger 2. el correo en la mesa, por favor.

¿En qué trabaja?Various people are describing their work. After reading the description, choose the correct profession. Type only the letter in the blank. 6. Reparo todo tipo de automóviles y motocicletas. Nunca estoy sin trabajo. Soy un empleado responsable y tengo buenas cualificaciones. Una desventaja de mi puesto es que siempre estoy sucio.   a.carpintero      b.bombero     c.mecánico Your answer: